<div style="text-align:left;"><img src="http://thimg.todayhumor.co.kr/upfile/201704/1491015570c690ebaf5e124429bca8da1d8e05b64c__mn668962__w1440__h1394__f208519__Ym201704.jpg" width="800" height="774" alt="P20170401_115630999_E6C4B6AB-FA37-48B0-B3BD-D9FD23C4E091.JPG" class="chimg_photo" style="border:none;" filesize="208519"></div><br><div><br></div> <div>요 문제 풀고 있는데요</div> <div><br></div> <div> <div>public class ch4_2 {</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>public class Rectangle{</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>public int x1,x2,y1,y2;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>public Rectangle(){}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>public Rectangle(int x1,int y1, int x2,int y2){</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.x1=x1;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.x2=x2;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.y1=y1;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.y2=y2;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>void set(int x1, int y1, int x2, int y2){</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.x1=x1;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.x2=x2;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.y1=y1;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>this.y2=y2;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>void show(){</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>int s ;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>s = (x1-x2)*(y1-y2);</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>if(s<0)</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>s*=-1;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>System.out.println("사각형의 넓이 " + s);</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>System.out.println("좌표 x1 >> " + x1 + "좌표 y1 >> "+ y1 +"좌표 x1 >> " + x2 + "좌표 y2 >> "+ y2);</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>int square(){</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>int s ;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>s = (x1-x2)*(y1-y2);</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>if(s<0)</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>s*=-1;</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>return s; </div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>//<span class="Apple-tab-span" style="white-space:pre;"> </span>boolean equals(Rectangle r){</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>//<span class="Apple-tab-span" style="white-space:pre;"> </span>if(r == )</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>//}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>}</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>public static void main(String[] args) {</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>Rectangle r = new Rectangle(); <b><font size="5"><- 여기가 no enclosing instance 에러가 나요 </font></b></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>Rectangle s = new Rectangle(1,1,2,3);</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>r.show();</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>s.show();</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>System.out.println(s.square());</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>r.set(-2,2,-1,4);</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>r.show();</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>System.out.println(r.square());</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>//if(r.equals(s))</div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>//System.out.println("두 사각형은 같습니다");</div> <div><br></div> <div><span class="Apple-tab-span" style="white-space:pre;"> </span>}</div> <div><br></div> <div>}</div></div> <div><br></div> <div><br></div> <div>그리고 boolean을 어떻게 짜야 될지 모르겠어요</div> <div>자바 어려워요</div> <div>도와주세요 </div>
<a href="http://imgur.com/yYjX1uf"><img src="http://i.imgur.com/yYjX1uf.jpg" title="source: imgur.com" width="400" height="300" alt="yYjX1uf.jpg"></a>
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