CopyOnWriteArraySet的clear()方法将擦除Set中的所有元素。调用函数后,Set的大小变为零。
用法:
public void clear()
返回值:该函数不返回任何内容。
以下示例程序旨在说明上述函数:
示例1:
// Java Program to illustrate the CopyOnWriteArraySet
// clear() method in Java
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet<Integer> ArrSet
= new CopyOnWriteArraySet<Integer>();
// Add elements
ArrSet.add(32);
ArrSet.add(67);
ArrSet.add(98);
ArrSet.add(98);
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// Clear the CopyOnWriteArraySet
// Using clear() method
ArrSet.clear();
System.out.println("\nCopyOnWriteArraySet cleared\n");
// Print the updated CopyOnWriteArraySet
System.out.println("Updated CopyOnWriteArraySet: "
+ ArrSet);
}
}
输出:
CopyOnWriteArraySet: [32, 67, 98] CopyOnWriteArraySet cleared Updated CopyOnWriteArraySet: []
示例2:
// Java Program to illustrate the CopyOnWriteArraySet
// clear() method in Java
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// create object of CopyOnWriteArraySet
CopyOnWriteArraySet<String> ArrSet
= new CopyOnWriteArraySet<String>();
// Add elements
ArrSet.add("gopal");
ArrSet.add("gfg");
ArrSet.add("jgec");
ArrSet.add("jgec");
// print CopyOnWriteArraySet
System.out.println("CopyOnWriteArraySet: "
+ ArrSet);
// Clear the CopyOnWriteArraySet
// Using clear() method
ArrSet.clear();
System.out.println("\nCopyOnWriteArraySet cleared\n");
// Print the updated CopyOnWriteArraySet
System.out.println("Updated CopyOnWriteArraySet: "
+ ArrSet);
}
}
输出:
CopyOnWriteArraySet: [gopal, gfg, jgec] CopyOnWriteArraySet cleared Updated CopyOnWriteArraySet: []
参考: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#clear–
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注:本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CopyOnWriteArraySet clear() method in Java。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。