java基础的详细了解第三天

TestDemo1.java:11: 错误: name 在 Person 中是 private 访问控制
                per.name = "张三";
                   ^
TestDemo1.java:12: 错误: age 在 Person 中是 private 访问控制
                per.age = 13;
                   ^
2 个错误

class Person{
	private String name;
	private int age;
	public void setName(String name){
		this.name = name;
	}
	public String getName(){
		return name;
	}
	public void setAge(int age){
		this.age = age;
	}
	public int getAge(){
		return age;
	}
	public void info(){
		System.out.println("name = "+ name +" \nage = " + age);
	}
}
public class TestDemo1{
	public static void main(String args[]){
		Person per = new Person();
		per.setName("张三");
		per.setAge(13);
		per.info();
	}
}

class Person{
	private String name;
	private int age;
	public Person(){}
	public Person(String name){
		name = name;
	}
	public Person(String name, int age){
		name = name;
		age = age;
	}
	public void setName(String name){
		this.name = name;
	}
	public String getName(){
		return name;
	}
	public void setAge(int age){
		this.age = age;
	}
	public int getAge(){
		return age;
	}
	public void info(){
		System.out.println("name = "+ name +" \nage = " + age);
	}
}
public class TestDemo1{
	public static void main(String args[]){
		Person per = new Person("李四",80);
		per.setName("张三");
		per.setAge(13);
		per.info();
	}
}

class Emp{
	private int empno;
	private String ename;
	private String job;
	private double sal;
	private double comm;
	public Emp(int no,String name,String j,double s,double c){
		setEmpno(no);
		setEname(name);
		setJob(j);
		setSal(s);
		setComm(c);
	}
	public void setEmpno(int no){
		empno = no;
	}
	public void setEname(String name){
		ename = name;
	}
	public void setJob(String job){
		job = job;
	}
	public void setSal(double s){
		sal = s;
	}
	public void setComm(double c ){
		comm = c;
	}
	public int getEmpnoP(){
		return empno;
	}
	public String getEname(){
		return ename;
	}
	public String getJob(){
		return job;
	}
	public double getSal(){
		return sal;
	}
	public double getComm(){
		return comm;
	}
	public String getInfo(){
		return "empno = " + empno + "\n" +
				"ename = " +ename + "\n" +
				"job = " +job + "\n" +
				"sal = " +sal + "\n" +
				"comm = " +comm ;
	}
}
public class TestDemo2{
	public static void main(String args[]){
		//测试类
        System.out.printf(new Emp(2021,"Joker","CEO",2000.0,0.0).getInfo());
	}
}

public class TestDemo3{
	public static void main(String args[]){
		//第一种声明的方式
		int [] num = new int [3];
		//第二种声明数组的方式
		int [] num = null;
		num = new int [3];
		num[0] = 0;
		num[1] = 1;
		num[2] = 2;
		for(int i = 0;i < num.length ; i++){
			System.out.println(num[i]);
		}
	}
}