Java 中的集合填充()方法，示例

原文:https://www . geesforgeks . org/collections-fill-method-in-Java-with-examples/

java.util.Collections 类的 fill() 方法用于用指定的元素替换指定列表的所有元素。

该方法在线性时间内运行。

语法:

public static  void fill(List list, T obj)

参数:该方法以下列参数为参数

  • 列表–要用指定元素填充的列表。
  • obj–填充指定列表的元素。

以下是说明填充()方法的示例

例 1:

// Java program to demonstrate
// fill() method
// for String value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv) throws Exception
    {
        // creating object of List<Integer>
        List<String> arrlist = new ArrayList<String>();

        // Adding element to srclst
        arrlist.add("A");
        arrlist.add("B");
        arrlist.add("C");

        // print the elements
        System.out.println("List elements before fill: "
                           + arrlist);

        // fill the list
        Collections.fill(arrlist, "TAJMAHAL");

        // print the elements
        System.out.println("\nList elements after fill: "
                           + arrlist);
    }
}

Output:

List elements before fill: [A, B, C]

List elements after fill: [TAJMAHAL, TAJMAHAL, TAJMAHAL]

例 2:

// Java program to demonstrate
// fill() method
// for Integer value

import java.util.*;

public class GFG1 {
    public static void main(String[] argv) throws Exception
    {

        // creating object of List<Integer>
        List<Integer> arrlist = new ArrayList<Integer>();

        // Adding element to srclst
        arrlist.add(20);
        arrlist.add(30);
        arrlist.add(40);

        // print the elements
        System.out.println("List elements before fill: "
                           + arrlist);

        // fill the list
        Collections.fill(arrlist, 500);

        // print the elements
        System.out.println("\nList elements after fill: "
                           + arrlist);
    }
}

Output:

List elements before fill: [20, 30, 40]

List elements after fill: [500, 500, 500]

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