Java的基本數據類型

Java 語言提供了八種基本類型。六種數值類型(四種整數、兩種浮點)、一種字符類型和一種布爾值。

Java基本數據大小、默認值和取值范圍

IDEA中驗證基礎數據的大小、默認值和取值范圍

public class DataType {
    static byte b;
    static short s;
    static int i;
    static long l;
    static float f;
    static double d;
    static char c;
    static boolean bool;
    public static void main(String args[]) {
        System.out.println("byte[Size:"+Byte.SIZE
                +", Default value:"+b
                +"; Data range:"+Byte.MIN_VALUE+" ~ "+Byte.MAX_VALUE+"]");
        System.out.println("short[Size:"+Short.SIZE
                +", Default value:"+s
                +"; Data range:"+Short.MIN_VALUE+" ~ "+Short.MAX_VALUE+"]");
        System.out.println("int[Size:"+Integer.SIZE
                +", Default value:"+i
                +"; Data range:"+Integer.MIN_VALUE+" ~ "+Integer.MAX_VALUE+"]");
        System.out.println("long[Size:"+Long.SIZE
                +", Default value:"+l
                +"; Data range:"+Long.MIN_VALUE+" ~ "+Long.MAX_VALUE+"]");
        System.out.println("float[Size:"+Float.SIZE
                +", Default value:"+f
                +"; Data range:"+Float.MIN_VALUE+" ~ "+Float.MAX_VALUE+"]");
        System.out.println("double[Size:"+Double.SIZE
                +", Default value:"+d
                +"; Data range:"+Double.MIN_VALUE+" ~ "+Double.MAX_VALUE+"]");
        System.out.println("char[Size:"+Character.SIZE
                +", Default value:"+c
                +"; Data range:"+(int)Character.MIN_VALUE+" ~ "+(int)Character.MAX_VALUE+"]");
        System.out.println("boolean[Default value:"+bool
                +"; Data range:"+Boolean.TRUE+" & "+Boolean.FALSE+"]");
    }
}

運行結果：