문제

점을 클래스로 표현하는 문제입니다 이를 해결하는 프로그램의 다음 실행상태에 대해 빈칸을 채우세요

프로그램의 실행순서 및 실행상태

1  public static void main( String[] args ) {

점의 x좌표 값을 입력하세요 : 3
점의 y좌표 값을 입력하세요 : 4

3                  new XYpoint();

	main()
x	3
y	4
origin		x	y	XYpoint(),toString(),equals(),compareTo()	(obj01)

P2b  public XYpoint() {

P21   this( 0, 0 );

P1b  public XYpoint( int x, int y ) {

P1e  }

	main()
x	3
y	4
origin		x	y	XYpoint(),toString(),equals(),compareTo()	(obj01)
	()
this
	()
this
x
y

P2e  }

2   XYpoint origin =

	main()
x	3
y	4
origin

5                  new XYpoint( x, y );

	main()
x	3
y	4
origin	(obj01)	x	0	y	0	XYpoint(),toString(),equals(),compareTo()	(obj01)
point		x		y		XYpoint(),toString(),equals(),compareTo()	(obj02)

P1b  public XYpoint( int x, int y ) {

P1e  }

	main()
x	3
y	4
origin	(obj01)	x	y	XYpoint(),toString(),equals(),compareTo()	(obj01)
point		x	y	XYpoint(),toString(),equals(),compareTo()	(obj02)
	()
this
x
y

4   XYpoint point =

	main()
x	3
y	4
origin	(obj01)
point

6   if ( origin.equals( point ) ) {

P4b  public boolean equals( XYpoint that ) {

P4e  }

	main()
x	3
y	4
origin	(obj01)	x	0	y	0	XYpoint(),toString(),equals(),compareTo()	(obj01)
point	(obj02)	x	3	y	4	XYpoint(),toString(),equals(),compareTo()	(obj02)
	()
this
that
반환값

8   else {

9                        origin + "과 "

P3b  public String toString() {

P3e  }

(0,0)과

10                         + point + " 사이의 거리는 "

P3b  public String toString() {

P3e  }

(3,4) 사이의 거리는

11                         + point.compareTo( origin ) + "입니다" );

P5b  public double compareTo( XYpoint that ) {

P5e  }

5.0입니다

12  }

프로그램 코드

	import java.util.Scanner;
	import java.lang.Math; 
	class XYpoint 
	{
		private int x, y;
		
P1b		public XYpoint( int x, int y ) {
			this.x = x;						
			this.y = y;						
P1e		}
		
P2b		public XYpoint() {
P21			this( 0, 0 );						
P2e		}
	
P3b		public String toString() {
			return "(" + this.x + "," + this.y + ")";
P3e		}
	
P4b		public boolean equals( XYpoint that ) {
			return ( this.x == that.x ) && ( this.y == that.y );
P4e		}
	
P5b		public double compareTo( XYpoint that ) {
			return Math.sqrt( Math.pow( ( this.x - that.x ), 2 ) + Math.pow( ( this.y - that.y ), 2 ) );
P5e		}
	}
		
	public class XYpoints 
	{
1		public static void main( String[] args ) { 	
			Scanner scan = new Scanner( System.in );
			
			System.out.print( "점의 x좌표 값을 입력하세요 : " );
			int x = scan.nextInt();
			System.out.print( "점의 y좌표 값을 입력하세요 : " );
			int y = scan.nextInt();
	
2			XYpoint origin = 
3			               new XYpoint();
4			XYpoint point = 
5			               new XYpoint( x, y );
	
6			if ( origin.equals( point ) ) {
7				System.out.println( "이 점은 원점입니다" );
			}
8			else {
				System.out.println( 
9				                    origin + "과 " 
10				                     + point + " 사이의 거리는 "
11				                     + point.compareTo( origin ) + "입니다" );
			}
			
			scan.close();
12		}
	}