用示例链接 Java 中的 clear()方法
原文:https://www . geeksforgeeks . org/link edhashset-clear-method-in-Java-with-examples/
Java . util . linkedhashset类的 clear() 方法用于从该集合中移除所有元素。此调用返回后，集合将为空。
语法:
public void clear()
返回值:此方法不返回任何东西。
下面举例说明 clear() 方法。
例 1:
// Java program to demonstrate
// clear() method
// for Integer value
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
// Create the object of LinkedHashSet<Integer>
LinkedHashSet<Integer>
linkset = new LinkedHashSet<Integer>();
// populate hash set
linkset.add(10);
linkset.add(20);
linkset.add(30);
// print the LinkedHashSet
System.out.println("LinkedHashSet: "
+ linkset);
// clear set values
// using clear() method
linkset.clear();
// print the LinkedHashSet
System.out.println("LinkedHashSet after "
+ "use of clear() method: "
+ linkset);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
LinkedHashSet: [10, 20, 30]
LinkedHashSet after use of clear() method: []
例 2:
// Java program to demonstrate
// clear() method
// for String value
import java.util.*;
public class GFG1 {
public static void main(String[] argv) throws Exception
{
try {
// Create the object of LinkedHashSet<Integer>
LinkedHashSet<String>
linkset = new LinkedHashSet<String>();
// populate hash set
linkset.add("A");
linkset.add("B");
linkset.add("C");
// print the LinkedHashSet
System.out.println("LinkedHashSet: "
+ linkset);
// clear set values
// using clear() method
linkset.clear();
// print the LinkedHashSet
System.out.println("LinkedHashSet after "
+ "use of clear() method: "
+ linkset);
}
catch (NullPointerException e) {
System.out.println("Exception thrown : " + e);
}
}
}
Output:
LinkedHashSet: [A, B, C]
LinkedHashSet after use of clear() method: []
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