java中的重载OverLoad

方法的重载

TestOverLoad.java

//方法的重载
//方法名相同，返回类型相同，方法参数不同
public class TestOverload {
	void max(int a , int b) {
		System.out.println( a > b ? a : b );
	}
	
	void max(short a , short b) {
		System.out.println("short");
		System.out.println( a > b ? a : b );
	}
	
	void max(float a, float b) {
		System.out.println( a > b ? a : b );
	}
	
	public static void main(String[] args) {
		Test t = new Test();
		t.max(3, 4);
		short a = 3;
		short b = 4;
		t.max(a, b);
	}
}

 构造方法的重载

TestOverLoad.java

//构造方法的重载
public class TestOverLoad2 {
	public static void main(String[] args) {
		Person p = new Person();
		Person p1 = new Person(400);
		Person p2 = new Person(2, 500);
		p.info();
		p.info("ok");
	}
}

class Person {
	//构造方法的重载
	Person() {
		id = 0;
		age = 20;
	}
	
	Person(int _id) {
		id = _id;
		age = 23;
	}
	
	Person(int _id, int _age) {
		id = _id;
		age = _age;
	}
	
  //成员变量定义
  private int id;
  private int age = 20;
  //方法定义
  public int getAge() {return age;}
  public void setAge(int i) {age = i;}
  public int getId() {return id;}
  
  //方法的重载
  void info() {
  	System.out.println("my id is : " + id);
  }
  
  void info(String t) {
  	System.out.println(t + " id " + id);
  }
}