Java If ... Else 示例
實際示例
此示例演示瞭如何使用 if..else 在使用者輸入正確程式碼時“開啟門”
示例
int doorCode = 1337;
if (doorCode == 1337) {
System.out.println("Correct code. The door is now open.");
} else {
System.out.println("Wrong code. The door remains closed.");
}此示例演示瞭如何使用 if..else 來判斷一個數字是正數還是負數
示例
int myNum = 10; // Is this a positive or negative number?
if (myNum > 0) {
System.out.println("The value is a positive number.");
} else if (myNum < 0) {
System.out.println("The value is a negative number.");
} else {
System.out.println("The value is 0.");
}判斷一個人是否足夠大可以投票
示例
int myAge = 25;
int votingAge = 18;
if (myAge >= votingAge) {
System.out.println("Old enough to vote!");
} else {
System.out.println("Not old enough to vote.");
}判斷一個數字是偶數還是奇數
示例
int myNum = 5;
if (myNum % 2 == 0) {
System.out.println(myNum + " is even");
} else {
System.out.println(myNum + " is odd");
} 
