public class Test {
  void max(int a,int b) {
    System.out.println(a>b ? a:b);
  }
   
  void max(double a,double b) {
    System.out.println(a>b ? a:b);
  }
   
  public static void main(String[] args) {
    Test t = new Test();
    t.max(3,4);
    t.max(3.0,4.4);
  }
 
}

 4
 4.4

class ChongZai{
  public void a(int a);
   public void a(Strting a);
   public void a(int a,int b);
}

ChongZai  cz =new ChongZai();
cz.a(1);          //调用a(int a);
cz.a("传的参数");   //调用a(String a)
cz.a(1,2);         //调用a(int a,int b)

public void a(String a);
public void a(String a,String b);
public void a(String a,String b,String c);