package com.opslab.util; import model.User; import org.junit.Test; import java.util.*; public class PrintUtilTest { @Test public void testPrint() throws Exception { List list = new ArrayList<>(); list.add("test1"); list.add("test2"); list.add("test3"); System.out.println(list); Map<String,String> map = new HashMap<>(); map.put("1", "test1"); map.put("2", "test2"); map.put("3", "test3"); map.put("4", "test4"); System.out.println(map); Vector<String> all = new Vector<>(); all.add("hello"); all.add("world"); System.out.println(all); System.out.println(all.elements()); } @Test public void testArr(){ byte[] bytes = new byte[]{1,2,3}; System.out.println(bytes); char[] chars = new char[]{'a','b','中','文'}; System.out.println(chars); int[] ints = new int[]{1,2,34,}; System.out.println(ints); User[] users = new User[]{new User("11","aa"),new User("22","bb")}; System.out.println(users); } }