不使用局部变量的值 [英] The value of the local variable is not used

问题描述

以上所有变量的标题均带有警告.你能告诉我为什么会这样吗?

all of the variables above have the warning in the title. Could you please tell me why that is happening?

public class DataTypes {
    public static void main(String[] argv) {
        // new feature in JDK 7
        int x = 0b1010; // 12
        int y = 0b1010_1010;
        int ssn = 444_12_7691;
        long phone = 408_777_6666L;
        double num = 9_632_401_909.1_0_3;
        String twoLine = "line one\nline two";
    }
}

推荐答案

声明的变量从不使用，仅分配给它，因此会受到警告.

The variables you declared are never used, only assigned to, therefore you're being warned.

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