簡談Java傳值傳引用

本隨筆旨在強化理解傳值與傳引用

i :100
s :hello
model :testchange
model2 :changeModel

package newtest;

public class testman {
    
    class Model {
        int i = 0;
        public String s = "no value";
       
    }
    
    public static void changeInt(int i) {
        i = 10;
    }

    public static void changeString(String s) {
        s = "test";
    }

    public static void changeModel(Model model) {
        model.i = 10;
        model.s = "testchange";
    }

    public static void changeModel2(Model model) {
        model.i = 10;
        model.s = "changeModel";
    }

    public static void main(String[] args) {
        int i = 100;
        String s = "hello";
        Model model = new testman().new Model();
        Model model2 = new testman().new Model();

        changeInt(i);
        System.out.println("i :" + i);
        changeString(s);
        System.out.println("s :" + s);
        changeModel(model);
        System.out.println("model :" + model.s);
        changeModel2(model2);
        System.out.println("model2 :" + model2.s);

    }
}