JavaSE 参数传递机制 值传递和引用传递

package array;

public class FcuntionDemo3 {
    
    
    public static void main(String[] args) {
    
    
        int a = 10;
        change(a);
        System.out.println(a + " ---> line 7");
    }

    public static void change(int a) {
    
    
        System.out.println(a + " ---> line 11");
        a = 20;
        System.out.println(a + " ---> line 13");
    }
}

package array;

public class FunctionDemo4 {
    
    
    public static void main(String[] args) {
    
    
        int[] arrs = {
    
    10, 20, 30};
        change(arrs);
        System.out.println(arrs[1] + " ----> line 7");
    }

    public static void change(int[] arrs) {
    
    
        System.out.println(arrs[1] + " ----> line 11");
        arrs[1] = 222;
        System.out.println(arrs[1] + " ----> line 13");
    }
}