Example : How to change the password default symbol/character in Password field in Java using Net Beans IDE 8.2 .
public UserRegistrion() {
initComponents();
jPasswordfield1.setEchoChar('#');
} Example : How to display decrypt form of password character of Password field in Java using Net Beans IDE 8.2 .
import static javax.swing.JOptionPane.*;
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
String pass = new String(jPasswordField1.getPassword());
showMessageDialog(null,pass);
jTextField2.setText(pass);
}private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
if(jButton1.getText().equals("Show"))
{
JPasswordField1. setEchoChar((char)0) // Encrypt the letter
jButton1. setText("Hide")
}
else
{
JPasswordField1. setEchoChar('#') // Decrypt the letter
jButton1. setText("Show")
}
}Example : How to display customize decimal location of Float values in jTextField/text box in java using Net Beans IDE 8.2 .
import java.text.DecimalFormat;
import static javax.swing.JOptionPane.*;
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
//DecimalFormat x1= new DecimalFormat("Rs 0.0000"); //Customize format of decimal location
DecimalFormat x1= new DecimalFormat("0.0000");
DecimalFormat x2= new DecimalFormat("0.00");
double y= 40.42982566364;
//double y = Double.parseDouble(jTextField1.getText());
jTextField2.setText(x1.format(y));
jTextField3.setText(x2.format(y));
}
Output :
//Rs 40.4298
40.4298
40.42Example : How to accept Integer values in jTextField/text box in java using Net Beans IDE 8.2 .
import static javax.swing.JOptionPane.*;
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
int x1 =Integer.parseInt(jTextField1.getText());
showMessageDialog(null,x1);
int x2 =Integer.parseInt(jTextField2.getText());
showMessageDialog(null,x2);
int x3 = x1+x2;
String x4 = Integer.toString(x3);
//showMessageDialog(null,"Total Sum Value is = "+x4,"Calculation Result",
INFORMATION_MESSAGE);
jTextField3.setText(String.valueOf(x3));
jTextField3.setText(String.valueOf(x4));
}Example : How to accept Float values in jTextField/text box in java using Net Beans IDE 8.2 .
import static javax.swing.JOptionPane.*;
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
float num1, num2, result;
num1 = Float.parseFloat(jTextField1.getText()); //To convert String into Float
num2 = Float.parseFloat(jTextField2.getText());
result= num1+num2;
showMessageDialog(null,result);
jTextField3.setText(String.valueOf(result)); //To convert Float into String
}Example : How to enter only numbers in java text box using Net Beans IDE 8.2 .
private void jTxtRegMobileKeyTyped(java.awt.event.KeyEvent evt)
{
char x = evt.getKeyChar();
if(!(Character.isDigit(x)||(x==KeyEvent.VK_BACK_SPACE)||(x==KeyEvent.VK_DELETE)))
{
getToolkit().beep();
evt.consume();
}
}
------------- OR -------------
private void jTxtRegMobileKeyTyped(java.awt.event.KeyEvent evt)
{
char x = evt.getKeyChar();
if(Character.isLetter(x))
{
getToolkit().beep();
evt.consume();
}
}Example : How to enter only Text/Letters with space in java text box using Net Beans IDE 8.2 .
private void jTxtRegNameKeyTyped(java.awt.event.KeyEvent evt) {
// TODO add your handling code here:
char x= evt.getKeyChar();
if (!(Character.isAlphabetic(x)||(x==KeyEvent.VK_SPACE)||(x == KeyEvent.VK_DELETE))){
getToolkit().beep();
evt.consume();
}
}Example : How to enter only Text/Letters without space in java text box using Net Beans IDE 8.2 .
private void jTxtRegEmailKeyTyped(java.awt.event.KeyEvent evt) {
// TODO add your handling code here:
char x =evt.getKeyChar();
if(!Character.isLetter(x))
{
getToolkit().beep();
evt.consume();
}
}Example : How to Uppercase/Capitalize all letters in a jTextfield/Text box in java .
private void jTxtRegNameKeyTyped(java.awt.event.KeyEvent evt)
{
// TODO add your handling code here:
char x= evt.getKeyChar();
if(Character.isUpperCase(x))
{
evt.setKeyChar(Character.toLowerCase(x));
}
}
--------- OR ----------
private void jTxtRegNameKeyReleased(java.awt.event.KeyEvent evt)
{
// TODO add your handling code here:
String UC = jTxtRegName.getText().toUpperCase();
jTxtRegName.setText(UC);
}Example : How to show Small/Lowercase all letters in a jTextfield/text box in java .
private void jTxtRegNameKeyTyped(java.awt.event.KeyEvent evt)
{
// TODO add your handling code here:
char x= evt.getKeyChar();
if(Character.isLowerCase(x))
{
evt.setKeyChar(Character.toUpperCase(x));
}
}Example : How to make a jTextfield/text box read only in java .
public registration()
{
initComponents();
jTxtRegSlno.setEditable(false); // Readonly
}Example : How to make a jTextfield/text box to accept upto ten digit values only in java .
private void jTxtRegNameKeyTyped(java.awt.event.KeyEvent evt)
{
// TODO add your handling code here:
if(jTextfield1.getText().length()>=10)
evt.consume();
}Example : How to make a jTextfield/text box visible/invisible in java .
public registration()
{
initComponents();
jTxtRegSlno.setVisible(false); //Invisible text box
//jTxtRegSlno.setVisible(true); //Visible text box
}Example : How to focus a cursor in jTextfield/text box in java .
private void jTxtRegNameKeyPressed(java.awt.event.KeyEvent evt)
{
// TODO add your handling code here:
int x = evt.getKeyCode();
if (x==10)
{
jTxtRegFname.requestFocus();
//jTxtRegFname.grabFocus();
}
}Example : How to Enable/Disable a jTextfield/text box in java .
public registration()
{
initComponents();
jTxtRegSlno.setEnabled(true); // To make active/enable the text box.
jTxtRegSlno.setEnabled(false); // To make inactive/disable the box.
}
Example : How to convert String into Integer and Vice-versa in java .
import static javax.swing.JOptionPane.*;
public NumConverion()
{
initComponents();
int x1 =Integer.parseInt("455"); //Conversion of String into Integer.
int x2 =Integer.parseInt("145");
int x3 = x1+x2;
showMessageDialog(null,x1);
showMessageDialog(null,x2);
String x4 = Integer.toString(x3); //Conversion of Integer into String.
showMessageDialog(null,"Total Value "+x1+"+"+x2+" is "+x4,"Result",INFORMATION_MESSAGE);
}Example : How to convert numeric value into Words in java .
import static javax.swing.JOptionPane.*;
import java.text.DecimalFormat;
public class Num2Word extends javax.swing.JFrame
{
private static String input;
private static int num;
private static String[] units={"" , " One" , " Two" , " Three" , " Four" , " Five" , " Six" , "
Seven" , " Eight" , " Nine" };
private static String[] teen={" Ten" , " Eleven" , " Twelve" , " Thirteen" , " Fourteen" , "
Fifteen" , " Sixteen" , " Seventeen" , " Eighteen" , " Nineteen" };
private static String[] tens={" Twenty" , " Thirty" , " Forty" , " Fifty" , " Sixty" , " Seventy"
, " Eighty" , " Ninety" };
private static String[] maxs={"" , "" , " Hundred" , " Thousand" , " Lakh" , " Crore" };
public String convertNumberToWords(int n)
{
input=numToString(n);
String converted="";
int pos=1;
boolean hun=false;
while(input.length()> 0)
{
if(pos==1) // TENS AND UNIT POSITION
{ if(input.length()>= 2) // TWO DIGIT NUMBERS
{
String temp=input.substring(input.length()-2,input.length());
input=input.substring(0,input.length()-2);
//converted+=digits(temp);
converted = converted + digits(temp);
}
else if(input.length()==1) // 1 DIGIT NUMBER
{
converted+=digits(input);
input="";
}
pos++;
}
else if(pos==2) // HUNDRED POSITION
{
String temp=input.substring(input.length()-1,input.length());
input=input.substring(0,input.length()-1);
if(converted.length()> 0&&digits(temp)!="")
{
converted=(digits(temp)+maxs[pos]+" and")+converted;
hun=true;
}
else
{
if
(digits(temp)=="");
else
converted=(digits(temp)+maxs[pos])+converted;hun=true;
}
pos++;
}
else if(pos > 2) // REMAINING NUMBERS PAIRED BY TWO
{
if(input.length()>= 2) // EXTRACT 2 DIGITS
{
String temp=input.substring(input.length()-2,input.length());
input=input.substring(0,input.length()-2);
if(!hun&&converted.length()> 0)
converted=digits(temp)+maxs[pos]+" and"+converted;
else
{
if(digits(temp)=="");
else
converted=digits(temp)+maxs[pos]+converted;
}
}
else if(input.length()==1) // EXTRACT 1 DIGIT
{
if(!hun&&converted.length()> 0)
converted=digits(input)+maxs[pos]+" and"+converted;
else
{
if(digits(input)=="") ;
else
converted=digits(input)+maxs[pos]+converted;
input="";
}
}
pos++;
}
}
return converted;
}
private String digits(String temp) // TO RETURN SELECTED NUMBERS IN WORDS
{
String converted="";
for(int i=temp.length()-1;i >= 0;i--)
{
int ch=temp.charAt(i)-48;
if(i==0&&ch>1 && temp.length()> 1)
converted=tens[ch-2]+converted; // IF TENS DIGIT STARTS WITH 2 OR MORE IT FALLS UNDER
TENS
else if(i==0&&ch==1&&temp.length()==2) // IF TENS DIGIT STARTS WITH 1 IT FALLS UNDER
TEENS
{
int sum=0;
for(int j=0;j < 2;j++)
sum=(sum*10)+(temp.charAt(j)-48);
return teen[sum-10];
}
else
{
if(ch > 0)
converted=units[ch]+converted;
} // IF SINGLE DIGIT PROVIDED
}
return converted;
}
private String numToString(int x) // CONVERT THE NUMBER TO STRING
{
String num="";
while(x!=0)
{
num=((char)((x%10)+48))+num;
x/=10;
}
return num;
}
private void inputNumber()
{
try
{
num=Integer.parseInt(jTextField1.getText()); /From textbox/
// num=Integer.parseInt(jLabel2.getText()); /From static value from jlabel1/
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null, "Number should be Less than 1 Arab ");
System.exit(1);
}
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt)
{
// TODO add your handling code here:
Num2Word obj=new Num2Word(); //change the classname NumberToWord from extends class name
where this code is inserted
inputNumber();
jLabel1.setText("Total Rs. = : " +obj.convertNumberToWords(num)+" Only");
} 
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