java 集合和addAll（）方法

Posted 2021-05-08

import java.util.ArrayList;
import java.util.Collections;


public class UsefulCodes {
  
  //Collections and addAll() Method
  public static void collection(){
    String[] stuff = {"chocolate", "pizza","bread","rice"};
    
    ArrayList<String> list = new ArrayList<String>();
    list.add("youtube");
    list.add("google");
    list.add("outlook");
    
    System.out.printf("Collection = ");
    
    for(String z : list)
      System.out.printf("%s ",z);
    
    // Add all elements from stuff to List2
    Collections.addAll(list,stuff);
    
    System.out.printf("\nNew Collection = ");
    for(String z : list)
      System.out.printf("%s ",z);
    
  }
  
  // Main Method
  public static void main(String[] args) {
    collection();
  }
}