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Java Conversion


Java Java  J2EE 
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Java Conversion



1.   String to Integer:

In java, if we are converting string to integer then using, 

Integer.parseInt(String s) method.

public class StringToIntEx{  
public static void main(String args[]){  
String s="50";  
int i=Integer.parseInt(s);  
System.out.println(s+100); System.out.println(i+100);
}}  
 
Output:
50100
150

 

 


2.   Integer to String:


In java, if we are converting Integer to String then using, Integer. toString(int) or String.valueOf (int) methods.

 

public class IntegerToStrEx{  
public static void main(String args[]){  
int n=100;
String s=Integer.toString(n);
String ss=String,valueOf(n);  
System.out.println(s+100); System.out.println(ss+100);
System.out.println(n+100);
 
}}  
 
Output:
50100
50100
150
 

 

3.   String to Long:


In java, if we are converting String to Long then using, Long.parseLong (String s).

 

public class StringToLongEx{  
public static void main(String args[]){  
String s="8005366665";  
long l=Long.parseLong(s);  
System.out.println(l);
}}  
 
Output:
                8005366665
 

 

 

4.   Long to String:

In java, if we are converting Long to String then using, Long. toString (Long) or String.valueOf(Long) methods.


public class LongToStringEx{  
public static void main(String args[]){  
long l="8005366665";  
String s=Long.toString(l);
String ss=String.valueOf(l);  
System.out.println(s+100); System.out.println(ss+100);
}}  
 
Output:
8005366665
8005366665

 

 

 

5.   String to Float:

In java, if we are converting String to Float then using, Float.parseFloat (String s) method.


public class StringToFloatEx{  
public static void main(String args[]){  
String s="50.6";  
float f=Float.parseFloat(s);  
System.out.println(f);
}}  
 
Output:
50.6

 

 

 

6.   String to Double:

In java, if we are converting String to Double then using, Double.parseDouble (String s).

 

public class StringToDoubleEx{  
public static void main(String args[]){  
String s="50";  
double d=Double.parseDouble(s);  
System.out.println(d);
}}  
 
Output:
50
 

7.   String to Date:

We can convert String to Date in java using parse() method of DateFormat and SimpleDateFormat classes. We have also known about DateFormat and SimpleDateFormat classes previously.

 

import java.text.SimpleDateFormat;  
import java.util.Date;  
public class StringToDateEx {  
public static void main(String[] args)throws Exception {  
    
String D="10/12/2015";  
    Date D1=new SimpleDateFormat("dd/MM/yyyy").parse(D);  
    System.out.println(D+"\t"+D1);  
}  
}  
 
Output:
 
10/12/2015                         Thu Dec 10 07:32:15 IST 2015

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