Is double 0.0在java中大于或小于0

Question

我想要求更多的澄清。这是我的示例程序

double diff = 7.500 - 7.500;
System.out.println(diff); // result 0.0
if (diff > 0) {
    System.out.println("+" + diff ); //result +0.0
} else {
    System.out.println("-" + diff ); //result -0.0
}

我的结果是-0.0。我的期望值是0==0.0，如果有其他条件，则跳过。但它进入了else状态。double 0.0是大于还是小于0

Answer 1

在您的例子中，使用（更大）>将0.0与0进行比较，因此0.0严格来说并不大于0（它是相等的）。然后你的节目进入else部分

if(diff == 0 ) {
    System.out.println("+" + diff ); //result 0.0
} else if (diff > 0) {
    System.out.println("+" + diff ); //result +diff
} else { // diff is less than 0 
    System.out.println("-" + diff ); //result -diff
}