有只青蛙掉入十米深的井底，青蛙早晨往上爬三米， 傍晚往下猾两米，问青蛙用几天才能从井里出来？

package 有只青蛙掉入十米深的井底;/** *  * @author 何虎 * */public class CalculateToad{public static void main(String[] args){int day = 1;int miter = 10;Toad toad = new Toad();toad.setMiter(miter);while(true){toad.creep(3); //早上爬三米if(toad.getMiter() <= 0){break;}toad.creep(-2); //晚上滑落两米day++;}System.out.println("青蛙爬" + miter + "深的井需要" + day + "天");}}

<pre name="code" class="java">package 有只青蛙掉入十米深的井底;/* * 有只青蛙掉入十米深的井底，青蛙早晨往上爬三米， * 傍晚往下猾两米，问青蛙用几天才能从井里出来？ */public class Toad{private int miter;public int getMiter(){return miter;}public void setMiter(int miter){this.miter = miter;}/* * 青蛙爬井函数 */public void creep(int mit){this.miter -= mit; }}