Java常用的标识符

常用的标识符主要有，基本数据类型以及引用数据类型的。

如下图所示。

int、short ,long , byte ,

public class Demo04 {
    public static void main(String[] args) {
        int num10 = 54656;
        short num11 =124;
        long num12 = 12313214L;
        byte num13 = 15;

        System.out.println(num10);
        System.out.println(num11);
        System.out.println(num12);
        System.out.println(num13);
    }
}

double ,float

double num3 = 12313

(long，float后面要加L进行区分)

public class Demo05 {
    public static void main(String[] args) {
        double num01 = 2.5;
        float num02 = 3.32123F;


        System.out.println(num01);
        System.out.println(num02);
    }
}

表示类的标识符

String

public class Demo05 {
    public static void main(String[] args) {
        String name ="长街";
        System.out.println(name)
    }
}

boolaen flag = true

boolaen flag = false