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How to use Is class of org.hamcrest.core package

Best junit code snippet using org.hamcrest.core.Is

Source:CoreMatchers.java

...88   * instead of:89   * <pre>assertThat(cheese, equalTo(smelly))</pre>90   */91  public static <T> org.hamcrest.Matcher<T> is(org.hamcrest.Matcher<T> matcher) {92    return org.hamcrest.core.Is.is(matcher);93  }94  /**95   * A shortcut to the frequently used <code>is(equalTo(x))</code>.96   * For example:97   * <pre>assertThat(cheese, is(smelly))</pre>98   * instead of:99   * <pre>assertThat(cheese, is(equalTo(smelly)))</pre>100   */101  public static <T> org.hamcrest.Matcher<T> is(T value) {102    return org.hamcrest.core.Is.is(value);103  }104  /**105   * Provided to cause compile time error when used in preference to a possible runtime error if106   * this was not here.107   *108   * <p>This method was removed upstream between Hamcrest 1.1 and 1.3 in favour of the109   * instanceOf(Class) method. Unfortunately, existing usages of it could still compile against the110   * {@link #is(Object)} method instead. Although not every existing usage would compile111   * successfully it is possible that some could and that would result in a change in the runtime112   * behavior that could be difficult to detect and fix. This change aims to turn any significant113   * usage of this method into a compile time error.114   *115   * @deprecated Use instanceOf(SomeClass.class) instead.116   */117  public static void is(java.lang.Class<?> type) {118  }119  /**120   * A shortcut to the frequently used <code>is(instanceOf(SomeClass.class))</code>.121   * For example:122   * <pre>assertThat(cheese, isA(Cheddar.class))</pre>123   * instead of:124   * <pre>assertThat(cheese, is(instanceOf(Cheddar.class)))</pre>125   */126  public static <T> org.hamcrest.Matcher<T> isA(java.lang.Class<T> type) {127    return org.hamcrest.core.Is.isA(type);128  }129  /**130   * Creates a matcher that always matches, regardless of the examined object.131   */132  public static org.hamcrest.Matcher<java.lang.Object> anything() {133    return org.hamcrest.core.IsAnything.anything();134  }135  /**136   * Creates a matcher that always matches, regardless of the examined object, but describes137   * itself with the specified {@link String}.138   * 139   * @param description140   *     a meaningful {@link String} used when describing itself141   */142  public static org.hamcrest.Matcher<java.lang.Object> anything(java.lang.String description) {143    return org.hamcrest.core.IsAnything.anything(description);144  }145  /**146   * Creates a matcher for {@link Iterable}s that only matches when a single pass over the147   * examined {@link Iterable} yields at least one item that is matched by the specified148   * <code>itemMatcher</code>.  Whilst matching, the traversal of the examined {@link Iterable}149   * will stop as soon as a matching item is found.150   * For example:151   * <pre>assertThat(Arrays.asList("foo", "bar"), hasItem(startsWith("ba")))</pre>152   * 153   * @param itemMatcher154   *     the matcher to apply to items provided by the examined {@link Iterable}155   */156  public static <T> org.hamcrest.Matcher<java.lang.Iterable<? super T>> hasItem(org.hamcrest.Matcher<? super T> itemMatcher) {157    return org.hamcrest.core.IsCollectionContaining.<T>hasItem(itemMatcher);158  }159  /**160   * Creates a matcher for {@link Iterable}s that only matches when a single pass over the161   * examined {@link Iterable} yields at least one item that is equal to the specified162   * <code>item</code>.  Whilst matching, the traversal of the examined {@link Iterable}163   * will stop as soon as a matching item is found.164   * For example:165   * <pre>assertThat(Arrays.asList("foo", "bar"), hasItem("bar"))</pre>166   * 167   * @param item168   *     the item to compare against the items provided by the examined {@link Iterable}169   */170  public static <T> org.hamcrest.Matcher<java.lang.Iterable<? super T>> hasItem(T item) {171    return org.hamcrest.core.IsCollectionContaining.<T>hasItem(item);172  }173  /**174   * Creates a matcher for {@link Iterable}s that matches when consecutive passes over the175   * examined {@link Iterable} yield at least one item that is matched by the corresponding176   * matcher from the specified <code>itemMatchers</code>.  Whilst matching, each traversal of177   * the examined {@link Iterable} will stop as soon as a matching item is found.178   * For example:179   * <pre>assertThat(Arrays.asList("foo", "bar", "baz"), hasItems(endsWith("z"), endsWith("o")))</pre>180   * 181   * @param itemMatchers182   *     the matchers to apply to items provided by the examined {@link Iterable}183   */184  @SafeVarargs185  public static <T> org.hamcrest.Matcher<java.lang.Iterable<T>> hasItems(org.hamcrest.Matcher<? super T>... itemMatchers) {186    return org.hamcrest.core.IsCollectionContaining.<T>hasItems(itemMatchers);187  }188  /**189   * Creates a matcher for {@link Iterable}s that matches when consecutive passes over the190   * examined {@link Iterable} yield at least one item that is equal to the corresponding191   * item from the specified <code>items</code>.  Whilst matching, each traversal of the192   * examined {@link Iterable} will stop as soon as a matching item is found.193   * For example:194   * <pre>assertThat(Arrays.asList("foo", "bar", "baz"), hasItems("baz", "foo"))</pre>195   * 196   * @param items197   *     the items to compare against the items provided by the examined {@link Iterable}198   */199  @SafeVarargs200  public static <T> org.hamcrest.Matcher<java.lang.Iterable<T>> hasItems(T... items) {201    return org.hamcrest.core.IsCollectionContaining.<T>hasItems(items);202  }203  /**204   * Creates a matcher that matches when the examined object is logically equal to the specified205   * <code>operand</code>, as determined by calling the {@link java.lang.Object#equals} method on206   * the <b>examined</b> object.207   * 208   * <p>If the specified operand is <code>null</code> then the created matcher will only match if209   * the examined object's <code>equals</code> method returns <code>true</code> when passed a210   * <code>null</code> (which would be a violation of the <code>equals</code> contract), unless the211   * examined object itself is <code>null</code>, in which case the matcher will return a positive212   * match.</p>213   * 214   * <p>The created matcher provides a special behaviour when examining <code>Array</code>s, whereby215   * it will match if both the operand and the examined object are arrays of the same length and216   * contain items that are equal to each other (according to the above rules) <b>in the same217   * indexes</b>.</p> 218   * For example:219   * <pre>220   * assertThat("foo", equalTo("foo"));221   * assertThat(new String[] {"foo", "bar"}, equalTo(new String[] {"foo", "bar"}));222   * </pre>223   */224  public static <T> org.hamcrest.Matcher<T> equalTo(T operand) {225    return org.hamcrest.core.IsEqual.equalTo(operand);226  }227  /**228   * Creates an {@link org.hamcrest.core.IsEqual} matcher that does not enforce the values being229   * compared to be of the same static type.230   */231  public static org.hamcrest.Matcher<java.lang.Object> equalToObject(java.lang.Object operand) {232    return org.hamcrest.core.IsEqual.equalToObject(operand);233  }234  /**235   * Creates a matcher that matches when the examined object is an instance of the specified <code>type</code>,236   * as determined by calling the {@link java.lang.Class#isInstance(Object)} method on that type, passing the237   * the examined object.238   * 239   * <p>The created matcher forces a relationship between specified type and the examined object, and should be240   * used when it is necessary to make generics conform, for example in the JMock clause241   * <code>with(any(Thing.class))</code></p>242   * For example:243   * <pre>assertThat(new Canoe(), instanceOf(Canoe.class));</pre>244   */245  public static <T> org.hamcrest.Matcher<T> any(java.lang.Class<T> type) {246    return org.hamcrest.core.IsInstanceOf.any(type);247  }248  /**249   * Creates a matcher that matches when the examined object is an instance of the specified <code>type</code>,250   * as determined by calling the {@link java.lang.Class#isInstance(Object)} method on that type, passing the251   * the examined object.252   * 253   * <p>The created matcher assumes no relationship between specified type and the examined object.</p>254   * For example:255   * <pre>assertThat(new Canoe(), instanceOf(Paddlable.class));</pre>256   */257  public static <T> org.hamcrest.Matcher<T> instanceOf(java.lang.Class<?> type) {258    return org.hamcrest.core.IsInstanceOf.instanceOf(type);259  }260  /**261   * Creates a matcher that wraps an existing matcher, but inverts the logic by which262   * it will match.263   * For example:264   * <pre>assertThat(cheese, is(not(equalTo(smelly))))</pre>265   * 266   * @param matcher267   *     the matcher whose sense should be inverted268   */269  public static <T> org.hamcrest.Matcher<T> not(org.hamcrest.Matcher<T> matcher) {270    return org.hamcrest.core.IsNot.not(matcher);271  }272  /**273   * A shortcut to the frequently used <code>not(equalTo(x))</code>.274   * For example:275   * <pre>assertThat(cheese, is(not(smelly)))</pre>276   * instead of:277   * <pre>assertThat(cheese, is(not(equalTo(smelly))))</pre>278   * 279   * @param value280   *     the value that any examined object should <b>not</b> equal281   */282  public static <T> org.hamcrest.Matcher<T> not(T value) {283    return org.hamcrest.core.IsNot.not(value);284  }285  /**286   * A shortcut to the frequently used <code>not(nullValue())</code>.287   * For example:288   * <pre>assertThat(cheese, is(notNullValue()))</pre>289   * instead of:290   * <pre>assertThat(cheese, is(not(nullValue())))</pre>291   */292  public static org.hamcrest.Matcher<java.lang.Object> notNullValue() {293    return org.hamcrest.core.IsNull.notNullValue();294  }295  /**296   * A shortcut to the frequently used <code>not(nullValue(X.class)). Accepts a297   * single dummy argument to facilitate type inference.</code>.298   * For example:299   * <pre>assertThat(cheese, is(notNullValue(X.class)))</pre>300   * instead of:301   * <pre>assertThat(cheese, is(not(nullValue(X.class))))</pre>302   * 303   * @param type304   *     dummy parameter used to infer the generic type of the returned matcher305   */306  public static <T> org.hamcrest.Matcher<T> notNullValue(java.lang.Class<T> type) {307    return org.hamcrest.core.IsNull.notNullValue(type);308  }309  /**310   * Creates a matcher that matches if examined object is <code>null</code>.311   * For example:312   * <pre>assertThat(cheese, is(nullValue())</pre>313   */314  public static org.hamcrest.Matcher<java.lang.Object> nullValue() {315    return org.hamcrest.core.IsNull.nullValue();316  }317  /**318   * Creates a matcher that matches if examined object is <code>null</code>. Accepts a319   * single dummy argument to facilitate type inference.320   * For example:321   * <pre>assertThat(cheese, is(nullValue(Cheese.class))</pre>322   * 323   * @param type324   *     dummy parameter used to infer the generic type of the returned matcher325   */326  public static <T> org.hamcrest.Matcher<T> nullValue(java.lang.Class<T> type) {327    return org.hamcrest.core.IsNull.nullValue(type);328  }329  /**330   * Creates a matcher that matches only when the examined object is the same instance as331   * the specified target object.332   * 333   * @param target334   *     the target instance against which others should be assessed335   */336  public static <T> org.hamcrest.Matcher<T> sameInstance(T target) {337    return org.hamcrest.core.IsSame.sameInstance(target);338  }339  /**340   * Creates a matcher that matches only when the examined object is the same instance as341   * the specified target object.342   * 343   * @param target344   *     the target instance against which others should be assessed345   */346  public static <T> org.hamcrest.Matcher<T> theInstance(T target) {347    return org.hamcrest.core.IsSame.theInstance(target);348  }349  /**350   * Creates a matcher that matches if the examined {@link String} contains the specified351   * {@link String} anywhere.352   * For example:353   * <pre>assertThat("myStringOfNote", containsString("ring"))</pre>354   * 355   * @param substring356   *     the substring that the returned matcher will expect to find within any examined string357   */358  public static org.hamcrest.Matcher<java.lang.String> containsString(java.lang.String substring) {359    return org.hamcrest.core.StringContains.containsString(substring);360  }361  /**...

Using AI Code Generation

1import static org.hamcrest.CoreMatchers.is;2import static org.hamcrest.MatcherAssert.assertThat;3import static org.hamcrest.CoreMatchers.equalTo;4import static org.hamcrest.MatcherAssert.assertThat;5import static org.hamcrest.CoreMatchers.sameInstance;6import static org.hamcrest.MatcherAssert.assertThat;7public class IsExample {8	public static void main(String[] args) {9		assertThat(10, is(10));10		assertThat(10, equalTo(10));11		Integer i = new Integer(10);12		assertThat(i, sameInstance(i));13	}14}15In this tutorial, we will learn about the Is class of org.hamcrest.core package. The Is class is used to create a matcher that matches if the examined object matches the specified matcher. The Is class is a wrapper class that wraps the specified matcher. The Is class extends BaseMatcher class and implements Matcher interface. The Is class provides a static method named is() to create a Is matcher. The is() method accepts a matcher as an argument and returns a Is matcher. The Is matcher matches if the examined object matches the specified matcher. The Is class provides a static method named not() to create a Is matcher that matches if the examined object does not match the specified matcher. The not() method accepts a matcher as an argument and returns a Is matcher. The Is matcher matches if the examined object does not match the specified matcher. The Is class provides a static method named notNullValue() to create a Is matcher that matches if the examined object is not null. The notNullValue() method does not accept any argument and returns a Is matcher. The Is matcher matches if the examined object is not null. The Is class provides a static method named nullValue() to create a Is matcher that matches if the examined object is null. The nullValue() method does not accept any argument and returns a Is matcher. The Is matcher matches if the examined object is null. The Is class provides a static method named sameInstance() to create a Is matcher that matches if the examined object is the same instance as the specified object. The sameInstance() method accepts an

Using AI Code Generation

1import static org.hamcrest.CoreMatchers.is;2import static org.hamcrest.CoreMatchers.not;3import static org.hamcrest.CoreMatchers.nullValue;4import static org.hamcrest.MatcherAssert.assertThat;5import static org.hamcrest.Matchers.containsString;6import static org.hamcrest.Matchers.equalTo;7import static org.hamcrest.Matchers.hasItem;8import static org.hamcrest.Matchers.hasItems;9import static org.hamcrest.Matchers.hasToString;10import static org.hamcrest.Matchers.isA;11import static org.hamcrest.Matchers.isEmptyString;12import static org.hamcrest.Matchers.isEmptyOrNullString;13import static org.hamcrest.Matchers.not;14import static org.hamcrest.Matchers.notNullValue;15import static org.hamcrest.Matchers.nullValue;16import java.util.Arrays;17import java.util.List;18import org.hamcrest.Matcher;19public class HamcrestTest {20	public static void main(String[] args) {

Using AI Code Generation

1import org.hamcrest.core.Is;2import org.hamcrest.core.IsEqual;3import org.hamcrest.Is;4import org.hamcrest.IsEqual;5import static org.hamcrest.core.Is.*;6import static org.hamcrest.core.IsEqual.*;7import static org.hamcrest.Is.*;8import static org.hamcrest.IsEqual.*;9import static org.hamcrest.core.Is.*;10import static org.hamcrest.core.IsEqual.*;11import static org.hamcrest.Is.*;12import static org.hamcrest.IsEqual.*;13import static org.hamcrest.core.Is.*;14import static org.hamcrest.core.IsEqual.*;15import static org.hamcrest.Is.*;16import static org.hamcrest.IsEqual.*;17import static org.hamcrest.core.Is.*;18import static org.hamcrest.core.IsEqual.*;19import static org.hamcrest.Is.*;20import static org.hamcrest.IsEqual.*;21import static org.hamcrest.core.Is.*;22import static org.hamcrest.core.IsEqual.*;23import static org.hamcrest.Is.*;24import static org.hamcrest.IsEqual.*;25import static org.hamcrest.core.Is.*;26import static org.hamcrest.core.IsEqual.*;27import static org.hamcrest.Is.*;

Using AI Code Generation

1import org.hamcrest.core.Is;2import static org.hamcrest.MatcherAssert.assertThat;3import static org.hamcrest.Matchers.equalTo;4import static org.hamcrest.Matchers.is;5import static org.hamcrest.Matchers.not;6import static org.hamcrest.Matchers.nullValue;7import static org.hamcrest.Matchers.sameInstance;8import static org.hamcrest.Matchers.startsWith;9import static org.hamcrest.Matchers.endsWith;10import static org.hamcrest.Matchers.containsString;11import static org.hamcrest.Matchers.contains;12import static org.hamcrest.Matchers.hasItems;13import static org.hamcrest.Matchers.hasSize;14import static org.hamcrest.Matchers.hasItemInArray;15import static org.hamcrest.Matchers.arrayContaining;16import static org.hamcrest.Matchers.arrayContainingInAnyOrder;17import static org.hamcrest.Matchers.arrayWithSize;18import static org.hamcrest.Matchers.emptyArray;19import static org.hamcrest.Matchers.emptyIterable;20import static org.hamcrest.Matchers.emptyString;21import static org.hamcrest.Matchers.emptyOrNullString;22import static org.hamcrest.Matchers.greaterThan;23import static org.hamcrest.Matchers.greaterThanOrEqualTo;24import static org.hamcrest.Matchers.lessThan;25import static org.hamcrest.Matchers.lessThanOrEqualTo;26import static org.hamcrest.Matchers.closeTo;27import static org.hamcrest.Matchers.either;28import static org.hamcrest.Matchers.both;29import static org.hamcrest.Matchers.not;30import static org.hamcrest.Matchers.anyOf;31import static org.hamcrest.Matchers.allOf;32import static org.hamcrest.Matchers.isA;33import static org.hamcrest.Matchers.instanceOf;34import static org.hamcrest.Matchers.isIn;35import static org.hamcrest.Matchers.notIn;36import static org.hamcrest.Matchers.hasToString;37import static org.hamcrest.Matchers.samePropertyValuesAs;38import static org.hamcrest.Matchers.hasProperty;39import static org.hamcrest.Matchers.hasEntry;40import static org.hamcrest.Matchers.hasKey;41import static org.hamcrest.Matchers.hasValue;42import static org.hamcrest.Matchers.hasItem;43import static org.hamcrest.Matchers.hasItems;44import static org.hamcrest.Matchers.hasItem;45import static org.hamcrest.Matchers.hasItems;46import static org.hamcrest.Matchers.hasItem;47import static org.hamcrest.Matchers.hasItems;48import static org.hamcrest.Matchers.hasItem;49import static org.hamcrest.Matchers.hasItems;50import static org.hamcrest.Matchers.hasItem;51import static org.hamcrest.Matchers.hasItems;52import static org.hamcrest.Matchers.hasItem;53import static org.hamcrest.Matchers.hasItems;54import static org.hamcrest.Matchers.hasItem;55import static org.hamcrest.Matchers.hasItems;56import static org.hamcrest.Matchers.hasItem;57import static org.hamcrest.Matchers.hasItems;58import static org.hamcrest.Matchers.hasItem;59import static org.hamcrest.Matchers.hasItems;60import static org.hamcrest.Matchers.hasItem;61import static org.hamcrest.Matchers.hasItems;62import static org.hamcrest.Matchers.hasItem;

Using AI Code Generation

1assertThat("Hello World", Is.is("Hello World"));2assertThat("Hello World", IsEqual.equalTo("Hello World"));3assertThat("Hello World", Is.is("Hello World"));4assertThat("Hello World", IsEqual.equalTo("Hello World"));5assertThat("Hello World", Is.is("Hello World"));6assertThat("Hello World", IsEqual.equalTo("Hello World"));7assertThat("Hello World", Is.is("Hello World"));8assertThat("Hello World", IsEqual.equalTo("Hello World"));9assertThat("Hello World", Is.is("Hello World"));10assertThat("Hello World", IsEqual.equalTo("Hello World"));11assertThat("Hello World", Is.is("Hello World"));12assertThat("Hello World", IsEqual.equalTo("Hello World"));13assertThat("Hello World", Is.is("Hello World"));14assertThat("Hello World", IsEqual.equalTo("Hello World"));15assertThat("Hello World", Is.is("Hello World"));16assertThat("Hello World", IsEqual.equalTo("Hello World"));17assertThat("Hello World", Is.is("Hello World"));18assertThat("Hello World", IsEqual.equalTo("Hello World"));19assertThat("Hello World", Is.is("Hello World"));20assertThat("Hello World", IsEqual.equalTo("Hello World"));

Using AI Code Generation

1import static org.hamcrest.CoreMatchers.is;2import static org.hamcrest.MatcherAssert.assertThat;3import org.junit.Test;4public class HamcrestExample {5    public void testHamcrest(){6        assertThat("Hello World", is("Hello World"));7    }8}9import static org.hamcrest.CoreMatchers.is;10import static org.hamcrest.MatcherAssert.assertThat;11import org.junit.Test;12public class HamcrestExample {13    public void testHamcrest(){14        assertThat("Hello World", is("Hello World"));15    }16}

Using AI Code Generation

1assertThat("abc", instanceOf(String.class));2assertThat("abc", is(instanceOf(String.class)));3assertThat("abc", isA(String.class));4assertThat("abc", is(not(instanceOf(Integer.class))));5assertThat("abc", is(notA(Integer.class)));6Latest Posts Latest posts by Ramesh Fadatare see all) How to use is() method of Is class of org.hamcrest.core package to check if the actual value is an instance of the expected type - February 16, 20187How to use is() method of Is class of org.hamcrest.core package to check

Source: Why is processing a sorted array faster than processing an unsorted array?

1<dependency>2   <groupId>junit</groupId>3   <artifactId>junit</artifactId>4   <version>4.12</version>5   <scope>test</scope>6</dependency>7<dependency>8   <groupId>org.hamcrest</groupId>9   <artifactId>hamcrest-core</artifactId>10   <version>1.3</version>11   <scope>test</scope>12</dependency>13<dependency>14   <groupId>org.hamcrest</groupId>15   <artifactId>hamcrest-library</artifactId>16   <version>1.3</version>17   <scope>test</scope>18</dependency>19

Source:Why is processing a sorted array faster than processing an unsorted array?

<dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
   <scope>test</scope>
</dependency>
<dependency>
   <groupId>org.hamcrest</groupId>
   <artifactId>hamcrest-core</artifactId>
   <version>1.3</version>
   <scope>test</scope>
</dependency>
<dependency>
   <groupId>org.hamcrest</groupId>
   <artifactId>hamcrest-library</artifactId>
   <version>1.3</version>
   <scope>test</scope>
</dependency>

Source: Why is processing a sorted array faster than processing an unsorted array?

1@Path("/authentication")2public class AuthenticationEndpoint {34    @POST5    @Produces(MediaType.APPLICATION_JSON)6    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)7    public Response authenticateUser(@FormParam("username") String username, 8                                     @FormParam("password") String password) {910        try {1112            // Authenticate the user using the credentials provided13            authenticate(username, password);1415            // Issue a token for the user16            String token = issueToken(username);1718            // Return the token on the response19            return Response.ok(token).build();2021        } catch (Exception e) {22            return Response.status(Response.Status.FORBIDDEN).build();23        }      24    }2526    private void authenticate(String username, String password) throws Exception {27        // Authenticate against a database, LDAP, file or whatever28        // Throw an Exception if the credentials are invalid29    }3031    private String issueToken(String username) {32        // Issue a token (can be a random String persisted to a database or a JWT token)33        // The issued token must be associated to a user34        // Return the issued token35    }36}37

Source:Why is processing a sorted array faster than processing an unsorted array?

@Path("/authentication")
public class AuthenticationEndpoint {

    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_FORM_URLENCODED)
    public Response authenticateUser(@FormParam("username") String username, 
                                     @FormParam("password") String password) {

        try {

            // Authenticate the user using the credentials provided
            authenticate(username, password);

            // Issue a token for the user
            String token = issueToken(username);

            // Return the token on the response
            return Response.ok(token).build();

        } catch (Exception e) {
            return Response.status(Response.Status.FORBIDDEN).build();
        }      
    }

    private void authenticate(String username, String password) throws Exception {
        // Authenticate against a database, LDAP, file or whatever
        // Throw an Exception if the credentials are invalid
    }

    private String issueToken(String username) {
        // Issue a token (can be a random String persisted to a database or a JWT token)
        // The issued token must be associated to a user
        // Return the issued token
    }
}

Source: Why is subtracting these two times (in 1927) giving a strange result?

1public enum Role {2 ROLE_1,3 ROLE_2,4 ROLE_35}6

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