Monday, October 27, 2014

JAVA NEW PROGRAMMES

String Buffer Trim
public class JavaStringBufferTrimExample
{
public static void main(String[] args)
{
 StringBuffer sbf = new StringBuffer("   Hello World  !  ");
 String str = sbf.toString().trim();
System.out.println("StringBuffer trim: \"" + str +"\"");
System.out.println("\"" + trim(sbf) + "\"");
}
private static String trim(StringBuffer sbf)
{
int start, end;
for(start = 0; start < sbf.length(); start++)
{
if(sbf.charAt(start) != ' ')
break;
}
for(end = sbf.length(); end > start ; end--)
{
if(sbf.charAt(end-1) != ' ')
break;
}
return sbf.substring(start, end);
    }
}
   
Java Convert int Array To String
import java.util.Arrays;
public class ConvertIntArrayToStringExample
{
public static void main(String args[])
{
int[] intNumbers = new int[]{1, 2, 3, 4,5};
StringBuffer sbfNumbers = new StringBuffer();
String strSeparator = " ";
if(intNumbers.length > 0){
sbfNumbers.append(intNumbers[0]);
 for(int i=1; i < intNumbers.length; i++)
{
sbfNumbers.append(strSeparator).append(intNumbers[i]);
}
}
System.out.println("int array converted to String using for loop");
System.out.println(sbfNumbers.toString());
String strNumbers = Arrays.toString(intNumbers);
System.out.println("String generated from Arrays.toString method: " + strNumbers);
 strNumbers = strNumbers.replaceAll(", ", strSeparator).replace("[", "").replace("]", "");
System.out.println("Final String: " + strNumbers);
  }
}
Java Reverse String Array
import java.util.Collections;
import java.util.List;
import java.util.Arrays;   
public class ReverseStringArrayExample
{
public static void main(String args[])
{
String[] strDays = new String[]{"Sunday", "Monday", "Tuesday", "Wednesday"};
List list = Arrays.asList(strDays);
Collections.reverse(list);  strDays = (String[]) list.toArray();
System.out.println("String array reversed");
for(int i=0; i < strDays.length; i++)
{
System.out.println(strDays[i]);
       }
    }
}
String Buffer To byte Array
public class StringBufferToByteArrayExample
{
 public static void main(String[] args)
{           
StringBuffer sbf = new StringBuffer("Java StringBuffer To byte array example");
 byte bytes[] = sbf.toString().getBytes();
 System.out.println("StringBuffer converted to byte array");
   }
}
String Buffer To File
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
public class JavaStringBufferToFileExample
{
 public static void main(String[] args) throws IOException
{
StringBuffer
sbf = new StringBuffer();
sbf.append("StringBuffer contents first line."); sbf.append(System.getProperty("line.separator"));sbf.append("StringBuffer contents second line.");
BufferedWriter bwr = new BufferedWriter(new FileWriter(new File("d:/demo.txt")));
bwr.write(sbf.toString());
bwr.flush();
bwr.close();
System.out.println("Content of StringBuffer written to File.");
   }
}

Convert Byte object to String object
public class ByteToStringExample
{
public static void main(String[] args)
{
Byte bObj = new Byte("10");
String str = bObj.toString();
System.out.println("Byte converted to String as " + str);
    }
}

Display Day of Week using Java Calendar
import java.util.Calendar;
public class DisplayDayOfWeek
{
public static void main(String[] args)
 {
 Calendar now = Calendar.getInstance();
System.out.println("Current date : " + (now.get(Calendar.MONTH) + 1)
+ "-"
+ now.get(Calendar.DATE)
+ "-"
+ now.get(Calendar.YEAR));
String[] strDays = new String[]
{
"Sunday",
"Monday",
"Tuesday",
"Wednesday",
"Thusday",
"Friday",
"Saturday"
};
System.out.println("Current day is : " +
strDays[now.get(Calendar.DAY_OF_WEEK) - 1]);
   
     }
  }

Disable Button
import java.applet.Applet;
import java.awt.Button;
public class DisableButtonExample extends Applet
{
public void init()
{
Button Button1 = new Button("Ok");
Button Button2 = new Button("Cancel");
add(Button1);
add(Button2);
Button2.setEnabled(false);
    }
}
Java String Buffer setLength
public class JavaStringBufferSetLengthExample
{
public static void main(String[] args)
{
StringBuffer sbf = new StringBuffer("StringBuffer setLength method example");
sbf.setLength(12);
System.out.println("StringBuffer contents: " + sbf);
sbf.setLength(0);
System.out.println("StringBuffer contents deleted:" + sbf);
   }
}



Convert String to long
public class StringToPrimitiveLongExample
{
public static void main(String[] args)
{
String str = new String("10");
long l = Long.parseLong(str);
System.out.println(l);
   }
}
Get Selected Item From Single Select AWT List
import java.applet.Applet;
import java.awt.Graphics;
import java.awt.List;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
public class GetSelectedItemFromSingleSelectExample extends Applet implements ItemListener
{  
List list = null;
public void init()
{
list = new List(5, false);
list.add("One");
list.add("Two");
list.add("Three");
list.add("Four");
list.add("Five");
list.add("Six");
list.add("Seven");
add(list);
list.addItemListener(this);
}
public void paint(Graphics g)
{
g.drawString("Selected Item: "+ list.getSelectedItem(), 10, 120);
}
public void itemStateChanged(ItemEvent arg0)
                    {
repaint();     
  }
}
Performing Binary Search on Java float Array
import java.util.Arrays;
public class BinarySearchFloatArrayExample
{
public static void main(String[] args)
{
float floatArray[] = {1.23f,2.10f,4.74f,5.34f};
Arrays.sort(floatArray);float searchValue = 4.74f;
int intResult = Arrays.binarySearch(floatArray,searchValue);
System.out.println("Result of binary search of 4.74 is : " + intResult);
searchValue = 3.33f;
intResult = Arrays.binarySearch(floatArray,searchValue);
System.out.println("Result of binary search of 3.33 is : " + intResult);
   }
}
Get Synchronized List from Java ArrayList
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class GetSynchronizedListFromArrayListExample
{
public static void main(String[] args)
{
ArrayList arrayList = new ArrayList();
List list = Collections.synchronizedList(arrayList);  
   }
}

Read file using FileInputStream
import java.io.*;
public class ReadStringFromFile
public static void main(String[] args)
{
File file = new File("C://FileIO//ReadString.txt");
int ch;
StringBuffer strContent = new StringBuffer("");
FileInputStream fin = null;
try 
 { 
 fin = new FileInputStream(file);
while( (ch = fin.read()) != -1)
strContent.append((char)ch);
fin.close();
}
catch(FileNotFoundException e)
{
System.out.println("File " + file.getAbsolutePath() +
" could not be found on filesystem");
}
catch(IOException ioe)
{
System.out.println("Exception while reading the file" + ioe);
}
System.out.println("File contents :");
System.out.println(strContent);
  }
}
Iterate through elements Java Vector using ListIterator
import java.util.Vector;
import java.util.ListIterator; 
public class IterateThroughVectorUsingListIteratorExample
{
public static void main(String[] args)
{
Vector v = new Vector();
v.add("1");
v.add("2");
v.add("3");
v.add("4");
v.add("5");
ListIterator itr = v.listIterator();
System.out.println("Iterating through Vector elements in forward direction...");
while(itr.hasNext())
System.out.println(itr.next());
System.out.println("Iterating through Vector elements in backward direction...");
while(itr.hasPrevious())
System.out.println(itr.previous());
  }
}
Remove All Items From a List
import java.applet.Applet;
import java.awt.List;
public class RemoveAllItemsFromAList extends Applet
{
public void init()
{
List list = new List(5, true);
list.add("One");
list.add("Two");
list.add("Three");
list.add("Four");
list.add("Five");
list.add("Six");
list.add("Seven");
add(list);
list.removeAll();
  }
}
Swap elements of Java ArrayList
import java.util.ArrayList;
import java.util.Collections;
public class SwapElementsOfArrayListExample
{
 public static void main(String[] args)
{
ArrayList arrayList = new ArrayList();
arrayList.add("A");
arrayList.add("B");
arrayList.add("C");
arrayList.add("D");
arrayList.add("E");
System.out.println("Before swaping, ArrayList contains : " arrayList);
Collections.swap(arrayList,0,4);
System.out.println("After swaping, ArrayList contains : " + arrayList);
   }
}
Get Foreground Color Of an Applet Window
import java.applet.Applet;
import java.awt.Color;
import java.awt.Graphics;
public class GetForgroundColorExample extends Applet
{
public void paint(Graphics g)
{
  Color c = getForeground();
  g.drawString(c.toString(),50,50);
   }
}



Replace an element at specified index of Java ArrayList
import java.util.ArrayList;
public class ReplaceElementAtSpecifiedIndexArrayListExample
{
public static void main(String[] args)
{
ArrayList arrayList = new ArrayList();
arrayList.add("1");
arrayList.add("2");
arrayList.add("3");
arrayList.set(1,"REPLACED ELEMENT");
System.out.println("ArrayList contains...");
for(int index=0; index < arrayList.size(); index++)
System.out.println(arrayList.get(index));
   }
}
Replace an element at specified index of Java ArrayList
import java.util.ArrayList;
public class ReplaceElementAtSpecifiedIndexArrayListExample
{
public static void main(String[] args)
 {
ArrayList arrayList = new ArrayList();
arrayList.add("1");
arrayList.add("2");
arrayList.add("3");
arrayList.set(1,"REPLACED ELEMENT");
System.out.println("ArrayList contains...");
for(int index=0; index < arrayList.size(); index++)
System.out.println(arrayList.get(index));
   }
}




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