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What are the basic data types of java

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Release： 2023-01-13 00:40:09

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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).

What are the basic data types of java

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:

What are the basic data types of java

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);

    }
}

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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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