System.out.println中的错误

该语句

System.out.println("");

public class ClassName {   System.out.println("this statement gives error"); // Error!! }

它应该放在大括号内，

{...}

{ System.out.println("this works fine"); }

这种方式是一个初始化程序块。

或应使用类似以下的方法编写：

public void methodName(){    System.out.println("inside a method, prints fine");}

您的完整程序 应类似于：

public class Area {double pi = 3.14;int r;int h;void areaOfCircle() {    double area1 = pi * r * r;    System.out.println("area of circle=" + area1);}void areaOfCylinder() {    double area2 = 2 * pi * r * (r + h);    System.out.println("area of cylinder=" + area2);}public static void main(String args[]) {    Scanner sc = new Scanner(System.in);    System.out.println("Enter the value of r");    Area a = new Area();    a.r = sc.nextInt();    System.out.println("enter the value h");    a.h = sc.nextInt();    a.areaOfCircle();    a.areaOfCylinder();   }}