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Variables should not be declared with spaces;

float length,width,radius,3.14,height,volume of box,volume of cylinder;

volume of box, instead you can give volume_of_box..


There are certain...

Keep the statements under if condition in braces. Like below

if((number>largest1)){
largest2=largest1;
largest1=number;
}

Provide the full printStackTrace(), then we can help you out

Comment {} on line 11, then it would be like this

public class ARG
{
public static void main(String[] args)
{


int[] A = new int[10000];