Java 迴圈語法：while 、do/while 、for 迴圈
While 迴圈簡單範例：
public class TaxDemo{
public static void main(String[] args){
double balance = 500;
double taxRate = 0.07;
int years = 0;
while (balance <= 1000){
balance = (balance * (1+0.07));
years++;
}
System.out.printf("Year %d: %.2f",years,balance);
}
}
修改一下 Elevator 的程式：(其他部份，請參考
這裡！)
public class Elevator{
...omit....
//判斷是否到達所須要的樓層
public void goToFloor(int desiredFloor){
while (this.currentFloor != desiredFloor){
if (this.currentFloor > desiredFloor){
this.goDown();
} else {
this.goUp();
}
}
System.out.println("Arrived..");
this.openDoor();
}
..... omit ......
執行的程式也一併修改一下：
import java.util.Scanner;
public class ElevatorDemo{
public static void main(String[] args){
Elevator myElevator = new Elevator();
Scanner scanner = new Scanner(System.in);
System.out.print("請選擇樓層(1~10)：");
myElevator.doorOpen = true;
myElevator.goToFloor(scanner.nextInt());
}
}
for 迴圈用法：(99乘法表)
public class table99{
public static void main(String[] args){
for (int i = 1,j = 1; i < 10 ; i=(j==9)?(i+1):(i),j=(j==9)?(1):(j+1)){
System.out.printf("%d*%d=%d\t",i,j,(i*j));
if (j==9){
System.out.println();
}
}
}
}
continue 與 break 也來湊熱鬧：
import java.util.*;
public class ScoreClassDemo{
public static void main(String[] args){
Scanner scanner = new Scanner(System.in);
ArrayList pass = new ArrayList();
ArrayList noPass = new ArrayList();
int account = 0;
int score = 0;
while (true){
System.out.printf("請輸入第 %d 位學生成績：",(account + 1));
score = scanner.nextInt();
if ((score > 100)||(score <= -2)){
System.out.println("重新輸入");
continue;
} else if (score == -1){
break;
} else if ( score >= 60){
pass.add(score);
} else {
noPass.add(score);
}
account++;
}
System.out.println("及格人數： " + pass.size());
}
}
