Java 实验3

实验3
/*
 * @(#)AverageNumbers2
 *
 * Copyright 2008 School of Software, Yunnan University.
 *                                  All rights reserved
 */
package cn.edu.ynu.sei.Java_Labs.Lab3;

/**
 * 求1－50的平均数
 * @version 1.0.0.0 Jan 22, 2008
 * @author eleven
 */
public class AverageNumbers2 {

    private double result1;
    private double sum1;
    private double result2;
    private double sum2;

    /**
     * 使用for循环计算
     */
    public double DeterminAverageUsingFor(int startNumber, int endNumber) {
        for (int i = startNumber; i <= endNumber; i++) {
            sum1 += i;
            result1 = sum1 / 50;
        }
        return result1;
    }

    /**
     * 使用while循环计算
     */
    public double DeterminAverageUsingWhile(int startNumber, int endNumber) {
        int i = startNumber;
        while (i <= endNumber) {
            sum2 += i;
            result2 = sum2 / 50;
            i++;
        }
        return result2;
    }

    public static void main(String[] args) {
        AverageNumbers2 an2 = new AverageNumbers2();
        double finalResult1 = an2.DeterminAverageUsingFor(1, 50);
        double finalResult2 = an2.DeterminAverageUsingWhile(1, 50);
        System.out.println("average of numbers is " + finalResult1 + ", which is calculated by for loop.");
        System.out.println("average of numbers is " + finalResult2 + ", which is calculated by while loop.");

    }
}



/*
 * @(#)BreakLoop
 *
 * Copyright 2008 School of Software, Yunnan University.
 *                                  All rights reserved
 */
package cn.edu.ynu.sei.Java_Labs.Lab3;

/**
 *  显示数字1－10，但是在5处跳出，并且打印
 * @version 1.0.0.0 Jan 23, 2008
 * @author eleven
 */
public class BreakLoop {

    public BreakLoop() {
        for (int i = 1; i <= 10; i++) {
            if (i < 5) {
                System.out.println("Count = " + i);
            }
            if (i == 5) {
                System.out.println("Broke out of the loop at count = " + i);
                break;
            }
        }
    }

    public static void main(String[] args) {
        BreakLoop bl = new BreakLoop();
    }
}


/*
 * @(#)ContinueLoop
 *
 * Copyright 2008 School of Software, Yunnan University.
 *                                  All rights reserved
 */
package cn.edu.ynu.sei.Java_Labs.Lab3;

/**
 *
 * @version 1.0.0.0 Jan 23, 2008
 * @author eleven
 */
public class ContinueLoop {

    private int j;

    public ContinueLoop() {
        for (int i = 1; i <= 10; i++) {
            if (i < 5) {
                System.out.println("Count = " + i);
            }
            if (i == 5) {
                j = i;
                continue;
            } else {
                System.out.println("Count = " + i);
            }
        }
        System.out.println("Used continue statement to skip printing" + j);
    }

    public static void main(String[] args) {
        ContinueLoop cl = new ContinueLoop();
    }
}