String to int in java

Java string to int example using Integer.parseInt()

The Integer.parseInt() method is used to convert string to int in java. It returns a primitive int value. It throws NumberFormatException when all the characters in the String are not digits.

Note: The first character in the string can be a minus ‘-‘ sign.

Example:

package
 
com.w3spoint
;
 
public
 
class
 StringToInt 
{
  
public
 
static
 
void
 main
(
String
 args
[
]
)
{
      
String
 str
=
"231"
;
      
int
 num1 
=
 
452
;
 
      
//convert string to int
      
int
 num2 
=
 
Integer
.
parseInt
(
str
)
;
      
int
 sum
=
num1
+
num2
;
      
System
.
out
.
println
(
"Result is: "
+
sum
)
;
  
}
}

package com.w3spoint; public class StringToInt {
public static void main(String args[]){
String str=”231″;
int num1 = 452;
//convert string to int
int num2 = Integer.parseInt(str);
int sum=num1+num2;
System.out.println(“Result is: “+sum);
}
}

Output:

Result is
:
 
683

Result is: 683

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Java string to int example using Integer.valueOf()

The Integer.valueOf() method is used to convert string to int in java. It returns an object of Integer class. It throws NumberFormatException when all the characters in the String are not digits.

Note: The first character in the string can be a minus ‘-‘ sign.

Example:

package
 
com.w3spoint
;
 
public
 
class
 StringToInt 
{
  
public
 
static
 
void
 main
(
String
 args
[
]
)
{
      
String
 str
=
"-430"
;
      
int
 num1 
=
 
210
;
 
      
//convert string to int
      
int
 num2 
=
 
Integer
.
valueOf
(
str
)
;
      
int
 sum
=
num1
+
num2
;
      
System
.
out
.
println
(
"Result is: "
+
sum
)
;
  
}
}

package com.w3spoint; public class StringToInt {
public static void main(String args[]){
String str=”-430″;
int num1 = 210; //convert string to int
int num2 = Integer.valueOf(str);
int sum=num1+num2;
System.out.println(“Result is: “+sum);
}
}

Output:

Result is
:
 
-
220

Result is: -220

Download this example.

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