Error in System.out.println

Question

Is there any error in the following code? It shows cant find symbol, symbol: class out location: class System. In the log, it show a lot of errors, including

java.lang.ClassFormatError: Method "" in class Area has illegal signature "(Ljava/lang/Object;)Ljava/lang/System$out$println;"

import java.util.*;
class Area
{
double pi=3.14;
Scanner sc=new Scanner(System.in);
System.out.println("Enter the value of r");
int r=sc.nextInt();
System.out.println("enter the value h");
int h=sc.nextInt();
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[])
   {
     Area a=new Area();
     a.areaOfCircle();
     a.areaOfCylinder();
   }
}

Answer 1

The statement System.out.println(""); should be written in some block. It cannot be written directly in class.

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

Either it should be inside curly braces {...} like:

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

This way is an initializer block.

Or it should be written in a method like:

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

Your complete program should be like:

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();
   }
}