Java by API/java.lang/StringBuilder

new StringBuilder(int capacity)

   <source lang="java">

public class Main {

 public static void main(String[] a) {
   StringBuilder builder1 = new StringBuilder();
   StringBuilder builder2 = new StringBuilder(0);
   StringBuilder builder3 = new StringBuilder(100);
   System.out.println(builder1.capacity());
   System.out.println(builder2.capacity());
   System.out.println(builder3.capacity());
 }

} /* 16 0 100

• /

 </source>
   
  
 
  

new StringBuilder(String str)

   <source lang="java">

public class Main {

 public static void main(String[] args) {
   StringBuilder lipsum = new StringBuilder("Lorem ipsum dolor sit amet.");
   System.out.println("lipsum = " + lipsum.toString());
   lipsum.delete(0, 28);
   System.out.println("lipsum = " + lipsum.toString());
   lipsum.deleteCharAt(lipsum.length() - 1);
   System.out.println("lipsum = " + lipsum.toString());
 }

}

 </source>
   
  
 
  

StringBuilder: append(char c)

   <source lang="java">

/*

* Copyright (c) Ian F. Darwin, http://www.darwinsys.ru/, 1996-2002.
* All rights reserved. Software written by Ian F. Darwin and others.
* $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS""
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* 
* Java, the Duke mascot, and all variants of Sun"s Java "steaming coffee
* cup" logo are trademarks of Sun Microsystems. Sun"s, and James Gosling"s,
* pioneering role in inventing and promulgating (and standardizing) the Java 
* language and environment is gratefully acknowledged.
* 
* The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
* inventing predecessor languages C and C++ is also gratefully acknowledged.
*/

/**

* StringBuilderDemo: construct the same String three different ways.
*/

public class Main {

 public static void main(String[] argv) {
   String s1 = "Hello" + ", " + "World";
   System.out.println(s1);
   // Build a StringBuilder, and append some things to it.
   StringBuilder sb2 = new StringBuilder();
   sb2.append("Hello");
   sb2.append(",");
   sb2.append(" ");
   sb2.append("World");
   // Get the StringBuilder"s value as a String, and print it.
   String s2 = sb2.toString();
   System.out.println(s2);
   // Now do the above all over again, but in a more
   // concise (and typical "real-world" Java) fashion.
   StringBuilder sb3 = new StringBuilder().append("Hello").append(",")
       .append(" ").append("World");
   System.out.println(sb3.toString());
 }

}

 </source>
   
  
 
  

StringBuilder: capacity()

   <source lang="java">

public class Main {

 public static void main(String[] a) {
   StringBuilder builder1 = new StringBuilder();
   StringBuilder builder2 = new StringBuilder(0);
   StringBuilder builder3 = new StringBuilder(100);
   System.out.println(builder1.capacity());
   System.out.println(builder2.capacity());
   System.out.println(builder3.capacity());
 }

} /* 16 0 100

• /

 </source>
   
  
 
  

StringBuilder: delete(int start, int end)

   <source lang="java">

public class Main {

 public static void main(String[] args) {
   StringBuilder lipsum = new StringBuilder("Lorem ipsum dolor sit amet.");
   System.out.println("lipsum = " + lipsum.toString());
   lipsum.delete(0, 28);
   System.out.println("lipsum = " + lipsum.toString());
   lipsum.deleteCharAt(lipsum.length() - 1);
   System.out.println("lipsum = " + lipsum.toString());
 }

}

 </source>
   
  
 
  

StringBuilder: insert(int offset, String str)

   <source lang="java">

public class Main {

 public static void main(String[] a) {
   StringBuilder builder = new StringBuilder("Line 1\n");
   builder.append("Line 3\n");
   String lineToInsert = "Line 2\n";
   
   builder.insert(0, lineToInsert);
   System.out.println(builder.toString());
 }

} /* Line 2 Line 1 Line 3

• /

 </source>
   
  
 
  

StringBuilder: reverse()

   <source lang="java">

/*

* Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*
*   - Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*
*   - Neither the name of Sun Microsystems nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

public class Main {

 public static void main(String[] args) {
   String palindrome = "Dot saw I was Tod";
   StringBuilder sb = new StringBuilder(palindrome);
   sb.reverse(); // reverse it
   System.out.println(sb);
 }

}

 </source>
   
  
 
  

StringBuilder: toString()

   <source lang="java">

public class Main {

 public static void main(String[] a) {
   StringBuilder builder = new StringBuilder("Line 1\n");
   builder.append("Line 3\n");
   String lineToInsert = "Line 2\n";
   
   builder.insert(0, lineToInsert);
   System.out.println(builder.toString());
 }

} /* Line 2 Line 1 Line 3

• /

 </source>