java基础(9)--方法重载

如System.out.println()方法即是方法重载的。

以下举例说明自定义sum()方法的重载

package cnblogs;
public class TestBase09MathReload {
public static void main(String[] args) {
System.out.println(sum(10,20));
System.out.println(sum(10L,20L));
System.out.println(sum(10.0,20.0));
}
//以下重载sum方法
public static int sum(int a,int b){
System.out.println("int求和");
return a+b;
}
public static long sum(long a,long b){
System.out.println("long求和");
return a+b;
}
public static double sum(double a,double b) {
System.out.println("double求和");
return a + b;
}
}