Java If ... Else 示例
实际示例
此示例演示了如何使用 if..else 在用户输入正确代码时“打开门”
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.");
}此示例演示了如何使用 if..else 来判断一个数字是正数还是负数
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.");
}判断一个人是否足够大可以投票
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.");
}判断一个数字是偶数还是奇数
示例
int myNum = 5;
if (myNum % 2 == 0) {
System.out.println(myNum + " is even");
} else {
System.out.println(myNum + " is odd");
} 
