语言基础

3.2.2 关系与条件运算符

下面是一个例子RelationalDemo，它定义了三个整型数并且使用关系运算符来比较它们，如下：

public class RelationalDemo { public static void main(String[] args) { //定义几个数 int i = 37; int j = 42; int k = 42; System.out.println("变量数值..."); System.out.println(" i = " + i); System.out.println(" j = " + j); System.out.println(" k = " + k); //大于 System.out.println("大于..."); System.out.println(" i > j = " + (i > j)); //false System.out.println(" j > i = " + (j > i)); //true System.out.println(" k > j = " + (k > j)); //false, they are equal //大于等于 System.out.println("大于等于..."); System.out.println(" i >= j = " + (i >= j)); //false System.out.println(" j >= i = " + (j >= i)); //true System.out.println(" k >= j = " + (k >= j)); //true //小于 System.out.println(小于..."); System.out.println(" i < j = " + (i < j)); //true System.out.println(" j < i = " + (j < i)); //false System.out.println(" k < j = " + (k < j)); //false //小于等于 System.out.println("小于等于..."); System.out.println(" i <= j = " + (i <= j)); //true System.out.println(" j <= i = " + (j <= i)); //false System.out.println(" k <= j = " + (k <= j)); //true //等于 System.out.println("等于..."); System.out.println(" i == j = " + (i == j)); //false System.out.println(" k == j = " + (k == j)); //true //不等于 System.out.println("不等于..."); System.out.println(" i != j = " + (i != j)); //true System.out.println(" k != j = " + (k != j)); //false } }

程序的输出为：

变量数值...

i = 37

j = 42

k = 42

大于...

i > j = false

j > i = true

k > j = false

大于等于...

i >= j = false

j >= i = true

k >= j = true

小于...

i < j = true

j < i = false

k < j = false

小于等于...

i <= j = true

j <= i = false

k <= j = true

等于...

i == j = false

k == j = true

Not equal to...

i != j = true

k != j = false

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