Archives: String

Java – Compare Strings

September 1, 2011 | By Prasanna Sherekar | Post comment

String Comparison in Java

— Example shows different ways of comparing two String Values in Java.

new String("test").equals("test") // --> true 

new String("test") == "test" // --> false 

new String("test") == new String("test") // --> false 

"test" == "test" // --> true 

"test" == "te" + "st" // --> true

Objects.equals("test", new String("test")) // --> true
Objects.equals(null, "test") // --> false
Objects.equals(null, null) // --> true

new String("test").equals("test") // --> true

new String("test") == "test" // --> false

new String("test") == new String("test") // --> false

"test" == "test" // --> true

"test" == "te" + "st" // --> true

Objects.equals("test", new String("test")) // --> true

Objects.equals(null, "test") // --> false

Objects.equals(null, null) // --> true

Java – Convert String to Long

January 1, 2011 | By Prasanna Sherekar | Post comment

Converting String to Long in Java

public class StringToLong {

    public static void main(String args[]) {
        String strLong = "2323232";

        //Convert String to long using Long.valueOf(),better because
        //it can cache frequently used long values
        long number = Long.valueOf(strLong);
        System.out.println("String to long conversion using valueOf :" + number);

        //Convert String to long in Java using java.lang.Long object
        strLong = "4444444444444444444";
        Long numberObject = new Long(strLong);
        number = numberObject; //auto boxing will take care of long to Long conversion
        System.out.println("String to long conversion example using Long object: " + number);

        //Convert String to long with Long.parseLong method in Java
        strLong = "999999999999999999";
        Long parsedLong = Long.parseLong(strLong);
        number = parsedLong; //auto-boxing will convert Long object to primitive long
        System.out.println("String to long conversion using parseLong() method: " + number);

        //Convert String to long using Long.decode() method in Java
        strLong = "-1023454";
        number = Long.decode(strLong);
        System.out.println("String to long conversion using decode() method: " + number);

        //String to long in hexadecimal format
        strLong = "0xFFFF";
        number = Long.decode(strLong);
        System.out.println("String to long example in hex format decode() method: " + number);

        //String to long in octal format
        strLong = "0777";
        number = Long.decode(strLong);
        System.out.println("String to long example in octal format decode() method: " + number);
    }
}

public class StringToLong {

public static void main(String args[]) {

String strLong = "2323232";

//Convert String to long using Long.valueOf(),better because

//it can cache frequently used long values

long number = Long.valueOf(strLong);

System.out.println("String to long conversion using valueOf :" + number);

//Convert String to long in Java using java.lang.Long object

strLong = "4444444444444444444";

Long numberObject = new Long(strLong);

number = numberObject; //auto boxing will take care of long to Long conversion

System.out.println("String to long conversion example using Long object: " + number);

//Convert String to long with Long.parseLong method in Java

strLong = "999999999999999999";

Long parsedLong = Long.parseLong(strLong);

number = parsedLong; //auto-boxing will convert Long object to primitive long

System.out.println("String to long conversion using parseLong() method: " + number);

//Convert String to long using Long.decode() method in Java

strLong = "-1023454";

number = Long.decode(strLong);

System.out.println("String to long conversion using decode() method: " + number);

//String to long in hexadecimal format

strLong = "0xFFFF";

number = Long.decode(strLong);

System.out.println("String to long example in hex format decode() method: " + number);

//String to long in octal format

strLong = "0777";

number = Long.decode(strLong);

System.out.println("String to long example in octal format decode() method: " + number);

}

Output:

String to long conversion using valueOf :2323232
String to long conversion example using Long object: 4444444444444444444
String to long conversion using parseLong() method: 999999999999999999
String to long conversion using decode() method: -1023454
String to long example in hex format decode() method: 65535
String to long example in octal format decode() method: 511

Java – Convert String to InputStream

December 25, 2010 | By Prasanna Sherekar | Post comment

Converting String to InputStream in Java

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class StringToInputStreamExample {

    public static void main(String[] args) throws IOException {
        String str = "This is a String ~ GoGoGo";

        // convert String into InputStream
        InputStream is = new ByteArrayInputStream(str.getBytes());

        // read it with BufferedReader
        BufferedReader br = new BufferedReader(new InputStreamReader(is));

        String line;
        while ((line = br.readLine()) != null) {
            System.out.println(line);
        }

        br.close();
    }

}

import java.io.BufferedReader;

import java.io.ByteArrayInputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

public class StringToInputStreamExample {

public static void main(String[] args) throws IOException {

String str = "This is a String ~ GoGoGo";

// convert String into InputStream

InputStream is = new ByteArrayInputStream(str.getBytes());

// read it with BufferedReader

BufferedReader br = new BufferedReader(new InputStreamReader(is));

String line;

while ((line = br.readLine()) != null) {

System.out.println(line);

}

br.close();

}