深度理解Java访问修饰符

class Student{//class 相当于c语言的struct
	int age;
	String name;
	double score;
	private int sex;		//不同类，无法访问这个成员
	public void cs(int a){  
		sex = a;
	}
	void introduce(){
		System.out.println("sex="+sex+",age="+ age +",name=" + name + ",score=" + score);
	}
	void testFunc(){
		System.out.println("testFunc");
	}
}
public class Test {
	public static void main(String[] args) {
		Student stu1 = new Student();
		//stu1.sex = 1;     因为类里面使用了private，不同类就无法访问
		stu1.cs(0);			//可以使用方法，间接修改成员
		stu1.age = 22;
		stu1.name = "xiaowei";
		stu1.score = 100;
		stu1.introduce();
		stu1.testFunc();
	}
}

/*
sex=0,age=22,name=xiaowei,score=100.0
testFunc
*/

class Student{//class 相当于c语言的struct
	private int age;
	String name;
	double score;
	private int sex;

	private void myage(int myage){	//不可见的方法，可以在别的方法中使用达到更改属性的目的
		age = myage;
	}
	public void setage(int realage){	//更改age
		age = realage;
	}
	public int getage(){	//输出age，方法里偷偷使用myage，输出永远是18
		myage(18);
		return age;
	}
	
	void cs(int a){
		sex = a;
	}
	void introduce(){
		System.out.println("sex="+sex+",age="+ age +",name=" + name + ",score=" + score);
	}
	void testFunc(){
		System.out.println("testFunc");
	}
}
public class Test {
	public static void main(String[] args) {
		Student stu1 = new Student();
		//stu1.sex = 1;
		stu1.cs(0);
		//stu1.age = 22;
		stu1.setage(36);	//更改年龄36
		stu1.name = "xiaowei";
		stu1.score = 100;
		stu1.introduce();
		stu1.testFunc();
		System.out.println("age="+stu1.getage());	//输出年龄是18，方法中偷偷调用了不可见的方法myage
	}
}

/*
sex=0,age=36,name=xiaowei,score=100.0
testFunc
age=18
*/