数组里的值放到另一个数组中,并转大写

1,方式一 （简单比较常见）

	public static void test1(){
    
	
        String[] strings1 = new String[]{
    "hello","world","wd","asd"};

        String[] strings2 = new String[strings1.length];
        
        for (int i = 0; i < strings1.length; i++) {
    
            strings2[i] = strings1[i].toUpperCase();
        }
        
        for (String s : strings2) {
    
            System.out.println(s);
        }
    }    

方式2 转集合后再转进行操作

    static int i = 0;
    
    public static void test1(){
    
    
        String[] strings1 = new String[]{
    "hello","world","wd","asd"};

        String[] strings2 = new String[strings1.length];

        Arrays.stream(strings1).collect(Collectors.toList()).forEach(s -> {
    
            strings2[i++] = s.toUpperCase();
        });
    }