java，编写一个类，包含一定的方法，主函数测试类，实例化2个实例，求大神发个给我，谢谢谢谢

public class Demo {
	private int id;
	private String name;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	public void printInfo(){
		System.out.println("输出:name="+this.name+",id="+this.id);
	}
	public static void main(String[] args) {
		Demo demo1=new Demo();
		Demo demo2=new Demo();
	}

}

刚写的希望能帮到你！

/*
被实例化类A
*/
public class TestA {

private String name;

private int age;

public void setName(String name){
this.name = name;

}

public String getName(){
return this.name;

}

public void setAge(int age){
this.age = age;

}

public int getAge(){
return this.age;

}

public void sayHi(){
System.out.println("大家好，我的名字叫'"+this.name+"'，我今年"+this.age+"岁。");

}

}

/*
被实例化类B
*/
public class TestB{

private String name;

private int age;

public void setName(String name){
this.name = name;

}

public String getName(){
return this.name;

}

public void setAge(int age){
this.age = age;

}

public int getAge(){
return this.age;

}

public void sayHi(){
System.out.println("大家好，我的名字叫'"+this.name+"'，我今年"+this.age+"岁。");

}
}

/*
主函数
*/
public class Test{
public static void main(String[] args) {
TestA testa = new TestA();

testa.setName("张三");

testa.setAge(18);

testa.sayHi();

TestB testb = new TestB();

testb.setName("李四");

testb.setAge(20);

testb.sayHi();

}
}