预期的; Java中用二进制值初始化int变量时出错

Question

Below is the code:

class PlayWithBinary {
    static int age;

    public static void main (String args[]){
        int i = 0b10101010;
        System.out.println("my age is: " + age + " my salary is: "+ i);
    }
}

In terminal I executed : javac PlayWithBinary.java

For some reasons it is showing this error message:

PlayWithBinary.java:5: ';' expected
        int i = 0b10101010;
                 ^
1 error

Any ideas?

Update: for those who are getting similar errors, here is the link to download JDK 8 - Java SE Development Kit 8 Downloads

Answer 1

确保您的项目配置了Java 7或更高级别的Java兼容级别，或者您可以修改代码以使用Integer.parseInt(String, int)

int i = Integer.parseInt("10101010", 2);

Answer 2

It sounds like you're using an older version of Java that doesn't support this. This feature was added in Java 7 - see the documentation and this related question . You should upgrade your Java version to fix this.

Alternatively, you can use Integer.parseInt(String, int) on your code: int i = Integer.parseInt("10101010", 2);