集合类

Posted 2020-06-07

//ArrayList实现接口

import java.util.*;

public class TestList {

    
    public static void main(String[] args) {
        
        ArrayList<Integer> array = new ArrayList<Integer>();
        
        for(int i=0;i<101;i++){
            
            array.add(i);
        }
        System.out.println("原先的数据：\n"+array);
        
        list.remove(10);
        
        System.out.println("移除之后的数据：\n"+array);
    }
}


//HashSet实现接口

import java.util.*;

public class TestSet {

    public static void main(String[] args) {
        
        ArrayList<String> array = new ArrayList<>();
        List.add("A");
        List.add("a");
        List.add("c");
        List.add("C");
        List.add("a");
        HashSet<String> hash = new HashSet<String>();
        hash.addAll(array);
        for(String x:hash){
        System.out.println(x);
    }
    }
}


//Map接口实现
import java.util.*;

public class TestMap {

    public static void main(String[] args) {
   
        HashMap<String,String> map = new HashMap<String,String>();
        HashMap<String,String> mvp = new HashMap<String,String>();
        map.put("001","A");
        map.put("002","B");
        map.put("003","C");
        map.put("004","D");
        map.put("005","E");
        map.put("006","F");
        System.out.println(map);
        mvp.putAll(map);
        mvp.remove("005");
        
        System.out.println(mvp);
        

    }
}