Question

class ee
{
    public static void main(String args[])
    {
        boolean a;
        a=true;
        System.out.println("Answer is "+a);
        a=false;
        System.out.println("Answer is "+a);
        if(a) System.out.println("This is not executed");
        a=true;
        if(a)
        System.out.println("This is executed");
        System.out.println("10>11 is "+(10>11));
    }
}

输出：

Ansewr是真的答案是错误的这是执行 10> 11是假的

为什么在输出的第三行显示“这是执行的”？为什么输出中没有“这不执行”？

Answer 1

让我们看一下代码的每一行。

class ee
{
    public static void main(String args[])
    {
        boolean a;

        a=true;
        System.out.println("Answer is " + a);  // OUTPUT Answer is true

        a=false;
        System.out.println("Answer is " + a);  // OUTPUT Answer is false

        //You are basically saying that if the statement is true, do this part(Inside the curly brackets)
        // a = false here so the program will not do inside the curly brackets
        if(a)
        {
            System.out.println("This is not executed");
        }

        a=true;

        // a = true here so the program will do inside the curly brackets
        if(a)
        {
            System.out.println("This is executed");
        }

        System.out.println("10>11 is "+(10>11));
    }
}

我想您知道if语句，但如果您想了解有关使用if语句的详情，请here

Answer 2

因为a在第一个if中为false，而在第二个中为true。 if语句中的语句仅在if条件为真时执行

Answer 3

         a=false;
        System.out.println("Answer is "+a);
        if(a) System.out.println("This is not executed");
        a=true;
        if(a)
        System.out.println("This is executed");

如果查看代码，则设置为false，如果（a）默认假设a为真，则不显示＆＃34;这没有被执行＆＃34;。你再次设置为true，所以现在显示＆＃34;执行＃34;。

Answer 4

我希望它能帮到你，正确地完成每条评论，

boolean a;  //default value false
                a=true; //assinged 'a' to true
                System.out.println("Answer is "+a); //so it prints true here
                a=false;   //again assigned it to false
                System.out.println("Answer is "+a);  // so it prints as false here
                if(a) System.out.println("This is not executed");
        /*
        the above line means as if(a){// a is false here, then it wont go inside, HENCE IT IS NOT THERE IN OUTPUT
        System.out.println("This is not executed");
        }

        */
                a=true; // again a assigned as true
                if(a)
                System.out.println("This is executed");
    /*
        the above line means as if(a){// a is true here, then it goes inside, HENCE IT IS THERE IN OUTPUT
        System.out.println("This is executed");
        }

        */

Answer 5

    a=false;
    System.out.println("Answer is "+a);
    if(a) System.out.println("This is not executed");
    a=true;
    if(a)
    System.out.println("This is executed");
    System.out.println("10>11 is "+(10>11));

a = false将a更改为false，因此if(a) System.out.println("This is not executed");未执行，然后传递a=true;使其成为真，这就是为什么执行System.out.println("This is executed"); bgot

布尔表达式，用于控制java中的if语句

5 个答案: