What are the basic data types of java

There are 8 basic data types in Java, namely: byte (bit), short (short integer), int (integer), long (long integer), float (single precision), double (double precision) ), char (character) and boolean (Boolean value).

The operating environment of this tutorial: windows7 system, java10 version, DELL G3 computer.

About Java’s 8 basic data types, their names, digits, default values, value ranges and examples are shown in the following table:

In order to verify the contents of the table, run the verification code in eclipse as follows:

 package com.ce.test;

class Test {
    static byte b;
    static short s;
    static int i;
    static long l;
    static float f;
    static double d;
    static char c;
    static boolean bo;

    public static void main(String[] args) {

      System.out.println("byte的大小："+Byte.SIZE
              +";默认值："+b
              +";数据范围："+Byte.MIN_VALUE+" - "+Byte.MAX_VALUE);

      System.out.println("short的大小："+Short.SIZE
              +";默认值："+s
              +";数据范围："+Short.MIN_VALUE+" - "+Short.MAX_VALUE);

      System.out.println("int的大小："+Integer.SIZE
              +";默认值："+i
              +";数据范围："+Integer.MIN_VALUE+" - "+Integer.MAX_VALUE);

      System.out.println("long的大小："+Long.SIZE
              +";默认值："+l
              +";数据范围："+Long.MIN_VALUE+" - "+Long.MAX_VALUE);

      System.out.println("float的大小："+Float.SIZE
              +";默认值："+f
              +";数据范围："+Float.MIN_VALUE+" - "+Float.MAX_VALUE);

      System.out.println("double的大小："+Double.SIZE
              +";默认值："+d
              +";数据范围："+Double.MIN_VALUE+" - "+Double.MAX_VALUE);

      System.out.println("char的大小："+Character.SIZE
              +";默认值："+c
              +";数据范围："+Character.MIN_VALUE+" - "+Character.MAX_VALUE);

      System.out.println("boolean的大小："+Byte.SIZE
              +";默认值："+bo
              +";数据范围："+Byte.MIN_VALUE+" - "+Byte.MAX_VALUE);

    }
}

The output result on the console is as shown below:

Why is the data range of the output char here not 0 - 65535?

The char type in Java is represented by two bytes, that is, sixteen bits. Because it is an unsigned number, it is 2 to the 16th power, and the value range is: 0 - 2^16-1;

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