java 基本数据类型


java的基本的数据类型一共有8种
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);
每一个都有一个Range(即范围)

/**
java-er.com
learn java is so easy
Basic Type
*/
 
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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