//方法的演示 public class MethodDemo { public static void main(String[] args) { say(); say(); System.out.println(Math.sqrt(25)); //sayHi();//编译错误,有参必须传参 //sayHi(250);//编译错误,参数类型不匹配 sayHi("zhangsan");// String name = "zhangsan" sayHi("lisi");// String name = "lisi" sayHi("wangwu");//String name = "wangwu" int a = getNum();//getNum()的值就是return后的那个数 System.out.println(a);//88 double b =plus(55,66);//double a =55,double b=66 System.out.println(b); // double num1 = 5.5,num2 = 6.6; // double b = plus(num1,num2);//double a =5.5,double b =6.6 // System.out.println(b); System.out.println("over"); } //有参有返回值 public static double plus(double a,double b){ double sum = a + b; return sum;//返回sum中的那个数 //return a+b;//返回a+b的值 } //无参有返回值 public static int getNum(){ //return;//编译错误,必须返回一个值 //return 8.88;//编译错误,返回值类型不匹配 return 88;//1.结束方法的执行,2.返回一个结果给调用方 } //有参无返回值---有参可以使用方法更灵活 public static void sayHi(String name){ System.out.println("大家好,我叫"+name); return;//1.结束方法的执行 } //无参无返回值 public static void say(){ System.out.println("大家好,我叫WKJ"); } }
Java基础知识体系-基础语法-08
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