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Code

 ///Name: Conner Wygaerts
///Period: 6
///Project Name: xy
///File Name: xy.java
///Date Finished: 2/10/16

    import java.util.Scanner;
  
  public class xy
{
    public static void main( String[] args )
    {
    
    System.out.println(" x          y");
    System.out.println("--------------");
    
    for ( double x= -10.0; x<=10.0; x= x + 0.5 )
    {
        double y = (x*x);
        System.out.print(x + "  ");
        System.out.println(y);
    }
    
    }
    }

Picture of the output