1 package debug; 2 3 class Demo { 4 /* 5 * 定义八种基本数据类型，如下 6 */ 7 8 public static void main(String[] args) { 9 //define char type 10 char a = '1'; //字符类型用单引号 11 System.out.println(a); 12 13 //define string type 14 String text = "Hello world"; //字符串类型用双引号 15 System.out.println(text); 16 17 //define float type 18 float f = 1.03F; //单精度浮点类型后面必须要带上F或者f，默认用F 19 System.out.println(f); 20 21 //define double type 22 double d = 1.345; //浮点类型默认为双精度，所以如果定义的是doule类型，后面就不需要再带上F 23 System.out.println(d); 24 25 //define short type 26 short s = 100; 27 System.out.println(s); 28 29 //define int type 30 int i = 101; 31 System.out.println(i); 32 33 //define long type 34 long l = 10000000000L; //定义长整型后面必须要带上L或者l，默认用L 35 System.out.println(l); 36 37 //define byte type 38 byte a1 = 102; 39 System.out.println(a1); 40 41 //define boolean 42 boolean b = false; 43 System.out.println(b); 44 45 46 } 47 48 }
输出如下：
1 1 2 Hello world 3 1.03 4 1.345 5 100 6 101 7 10000000000 8 102 9 false