java.util.ArrayList.clear()%uA0方法移除此列表中的元素。该列表为空后，这个调用返回。
声明
以下是java.util.ArrayList.clear()方法的声明
public void clear()
参数
-
NA
返回值
此方法不返回任何值。
异常
-
NA
例子
下面的示例演示java.util.Arraylist.clear()方法的用法。
package com.yiibai import java.util.ArrayList public class ArrayListDemo { public static void main(String[] args) { // create an empty array list with an initial capacity ArrayList<Integer> arrlist = new ArrayList<Integer>(5) // use add() method to add elements in the list arrlist.add(20) arrlist.add(30) arrlist.add(10) arrlist.add(50) // let us print all the elements available in list for (Integer number : arrlist) { System.out.println("Number = " + number) } // finding size of this list int retval = arrlist.size() System.out.println("List consists of "+ retval +" elements") System.out.println("Performing clear operation !!") arrlist.clear() retval = arrlist.size() System.out.println("Now, list consists of "+ retval +" elements") } }
让我们来编译和运行上面的程序，这将产生以下结果：
Number = 20 Number = 30 Number = 10 Number = 50 List consists of 4 elements Performing clear operation !! Now, list consists of 0 elements