java基本数据类型

Java basic data types are 8

String is not a basic data types, String can be seen as a char array (char [])
  • Byte byte : a signed 8-bit type , Range is (-128 to 127)
  • Short short : a signed 16-bit type,Range is (–32,768 to 32,767)
  • Int int : a signed 32-bit type,Range is (–2,147,483,648 to 2,147,483,647)
  • Long long : a signed 64-bit type,Range is (–9,223,372,036,854,775,808 to 9 ,223,372,036,854,775,807)
  • Float float : IEEE 754 floating point 32 bits , Range is (±1.4E-45 to ±3.4028235E38)
  • Double double  :  IEEE 754 floating point 64 bits , Range is ( ±4.9E-324 to ±1.7976931348623157E308 )
  • Boolean boolean :  only two possible values: true and false
  • Character char  : a 16 bit unsigned integer , Range is (0 — 65535);

public class BasicType {
        public static void main(String[] args){
                byte b = 10; // b < 127 and  b >-128
                System.out.println(b);
 
                short s = 10;
                System.out.println(s);
 
                int i = 3;
                System.out.println(i);
 
                long l = 199999999;
                System.out.println(l);
 
                float f = 2.34f;
                System.out.println(f);
 
                double d = 3.1415926;
                System.out.println(d);
 
                boolean bx = true;            
                System.out.println(bx);
 
                char c = 97;  //97 equals 'a'
                char c1 = 'a';
                System.out.println(c);
                System.out.println(c1);
        }}


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