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What is method overloading in java

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Release： 2019-11-09 11:51:21

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##Overload of java (Recommended learning: java course )

Overloading (overloading) is in a class, the method name is the same, but the parameters are different. The return types can be the same or different.

Each overloaded method (or constructor) must have a unique parameter type list.

The most commonly used place is the overloading of the constructor.

Overloading rules:

The overloaded method must change the parameter list (the number or type of parameters is different);

The overloaded method can change the return type;

The overloaded method can change the access modifier;

The overloaded method can declare new or wider checked exceptions;

Methods can be overloaded in the same class or in a subclass.

The return value type cannot be used as the criterion for distinguishing overloaded functions.

Example

public class Overloading {
    public int test(){
        System.out.println("test1");
        return 1;
    }
 
    public void test(int a){
        System.out.println("test2");
    }   
 
    //以下两个参数类型顺序不同
    public String test(int a,String s){
        System.out.println("test3");
        return "returntest3";
    }   
 
    public String test(String s,int a){
        System.out.println("test4");
        return "returntest4";
    }   
 
    public static void main(String[] args){
        Overloading o = new Overloading();
        System.out.println(o.test());
        o.test(1);
        System.out.println(o.test(1,"test3"));
        System.out.println(o.test("test4",1));
    }
}

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