Simple use of List, Set and Map in Collection.

Mainly let them input and output data separately. It should be noted that the output of Set needs to be traversed, and the input of Map is a key-value pair style.

List code:

package com.whvc.www;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class ListTest {
	public static void main(String[] args) {
		List<String>list=new ArrayList<String>();
		Scanner scan=new Scanner(System.in);
		while(true) {
			String str;
			str=scan.next();
			list.add(str);
			if(str.equals("q")) {
				break;
			}
		}
		for(int i=0;i<list.size();i++) {
			System.out.println(list.get(i));
		}
	}
}

Set code:

package com.whvc.www;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Scanner;
import java.util.Set;

public class SetTest {
	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		Set<String>s=new HashSet<String>();
		while(true){
			String str=scan.next();
			s.add(str);
			if(str.equals("q")) {
				break;
			}
		}
		
		Iterator<String>it=s.iterator();
		while(it.hasNext()) {
			String string=it.next();
			System.out.println(string);
		}
	}
}

Map code:

package com.whvc.www;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class MatTest {
	public static void main(String[] args) {
		Scanner scan=new Scanner(System.in);
		Map<String,String>m=new HashMap<String,String>();
		while(true) {
			String s=scan.nextLine();
			if(s.equals("q")) {
				break;
			}
			String []a=s.split(",");
			m.put(a[0], a[1]);
		}
		
			System.out.println(m);
		
	}
}