java参数传递小结

    补充：按值引用：表示方法接收的是调用者提供的值；

               按引用传递：表示方法接收的是调用者提供的变量地址；

    @org.junit.Test
    public void test12() {

        int result =10;
        
        add(result);
        System.out.println(result);

    }

    public void add(int a){
        a=a+5;
    }

 @org.junit.Test
    public void test13() {

        Student  student = new Student();
        student.setName("TEST");
        student.setSalary(100);

        
        student.addSalary(student);
        System.out.println(student.getSalary());

    }


    public class Student {

        public String name;

        private   int age;

        private int salary;

        public  void addSalary(Student student){
            this.salary =student.salary*3;
        }
    }

    @org.junit.Test
    public void test13() {

        Student  student = new Student();
        student.setName("TEST");
        student.setSalary(100);

        Student  student1 = new Student();
        student.setName("TEST1");
        student.setSalary(100);

        System.out.println("交换前：student:"+student.hashCode()+",student1:"+student1.hashCode());
        
        swap(student,student1);
        System.out.println("交换后：student:"+student.hashCode()+",student1:"+student1.hashCode());
    }

    public void swap(Student s,Student s1){
        System.out.println("交换前：s:"+s.hashCode()+",s1:"+s1.hashCode());
        Student temp =s;
        s=s1;
        s1=temp;
        System.out.println("交换后：s:"+s.hashCode()+",s1:"+s1.hashCode());
    }