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();
}
}