Understand all points related to java data type in comparison with c language
All integer values represented by 4 data types -byte,short,int,long
By default every integer number is considered as int type,it means when we use any integer no. in a program compiler and jvm will consider this number as int type number .
Class Example{
Void m1(byte b) {
System.out.println("byte-param");
}
void m1(short s) {
system.out.println("short-param");
}
void m1(int i) {
system.out.println("int-param");
}
void m1(long l) {
system.out.println("long-param");
}
Class Test {
public static void main (string[]args) {
Example e1=new example();
e1.m1(5);
byte b=5;
short s=5;
long l=5;
e1.m1(b);
e1.m1(s);
}
}
in above program inside main method we called m1 method by passing the argument 5 compiler and jvm will consider this integer value as int type value then compiler and vm will execute m1(int0 hence we got output int-param .
To represent a integer numbers as byte ,short,long type we must prefix/suffix cast operator or a special alphabet .
Examples-
To represent 50 as byte we must explicitly write below code
byte b1=50; -------------variable assignment
(byte)50 --------casting
To represent 50 as short type we must write below code
short s1=50; -------variabsle assignment
(short)50 ----------casting
To represent integer number 50 as long type we must explicitly write below code --
long l1=50; -----------variable assignment
(long)50; -------cast operator
50l/50L -------------suffix character
Rule-There is no suffix character to represent integer number as byte and short , we must use as cast operator or, variable assignment as shown in above lines .
In variable assignment we must follow one rule i.e value type and range must be lesser than variable type range
for example
int i1=5; Right
int i2=5L; Wrong
5 is a int type ,so allowed to store in int variable .
5L is a long type ,so not allowed to store in int variable .
But we can assign int type value in lessor range datatypes byte and short variables , because these datatypes don't have their own type of special values .
for example-byte b1=5; right
short s1=5; right
Rule- we cant store all integer number in byte and short variables . we can store only the integers which are in the range of byte and short .
byte range is " -128 to 127 "
short range is "-32,768 to 32,767 "
hence we can store int values in byte and short variables in this range .
byte b2=5000; wrong
short s2=500000; wrong
