Java - StringWriter write(String str,int off,int len) method

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Description

The Java StringWriter write(String str,int off,int len) method writes a portion of a string.

Declaration

Following is the declaration for java.io.StringWriter.write(String str,int off,int len) method.

public void write(String str,int off,int len)

Parameters

• str − String to be written.

• off − Offset from which to start writing characters.

• len − Number of characters to write.

Return Value

This method does not return a value.

Exception

NA

Example - Usage of StringWriter write(String str,int off,int len) method

The following example shows the usage of StringWriter write(String str,int off,int len) method.

StringWriterDemo.java

package com.tutorialspoint;

import java.io.StringWriter;

public class StringWriterDemo {
   public static void main(String[] args) {
      String s = "Hello World";

      // create a new writer
      StringWriter sw = new StringWriter();

      // write strings
      sw.write(s, 0, 4);
      sw.write(s, 5, 6);

      // print result by converting to string
      System.out.println("" + sw.toString());
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Hell World

Example - Write a Substring from a String

The following example shows the usage of StringWriter write(String str,int off,int len) method.

StringWriterDemo.java

package com.tutorialspoint;

import java.io.StringWriter;

public class StringWriterDemo {
   public static void main(String[] args) {
      StringWriter writer = new StringWriter();

      String str = "WelcomeToJava";
      writer.write(str, 7, 4);  // Writes "ToJa"

      System.out.println("Output: " + writer.toString());
   }
}

Output

Let us compile and run the above program, this will produce the following result−

Output: ToJa

Explanation

• The string "WelcomeToJava" has characters at index 7 to 10: 'T', 'o', 'J', 'a'.

• write(str, 7, 4) writes "ToJa" to the StringWriter.

Example - Extract and Write a Word

The following example shows the usage of StringWriter write(String str,int off,int len) method.

StringWriterDemo.java

package com.tutorialspoint;

import java.io.StringWriter;

public class StringWriterDemo {
   public static void main(String[] args) {
      StringWriter writer = new StringWriter();

      String sentence = "Java programming is powerful";
      writer.write(sentence, 5, 11);  // Writes "programming"

      System.out.println("Result: " + writer.toString());
   }
}

Output

Let us compile and run the above program, this will produce the following result−

Result: programming

Explanation

• The string "Java programming is powerful" starts the word "programming" at index 5.

• Length = 11 → captures "programming".

• write(sentence, 5, 11) writes "programming" to the buffer.