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

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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; } }