Control
Structures
while
class WhileLoops
{
public static void main(String[] args)
{
int temperature = 50;
while (temperature < 55)
{
System.out.println("Temperature is less than 55");
temperature =
temperature + 1;
}
}
}
Pre and Post
Increment
public class Increment
{
public static void main( String
args[] )
{
int c;
c = 5;
System.out.println( c );
// print 5
System.out.println( c++ ); // print 5 then
postincrement
System.out.println( c );
// print 6
System.out.println(); // skip a line
c = 5;
System.out.println( c ); // print 5
System.out.println( ++c ); // preincrement then print 6
System.out.println( c ); // print 6
}
}
for
import java.awt.Graphics;
import javax.swing.JApplet;
public class ForCounter extends JApplet
{
public void paint( Graphics g )
{
//
Initialization, repetition condition and incrementing
// are all
included in the for structure header.
for ( int
counter = 1; counter <= 10; counter++ )
g.drawLine( 10, 10, 250, counter * 10 );
}
}
// Counter-controlled repetition with the
for structure
import javax.swing.JOptionPane;
import javax.swing.*;
public class Sum
{
public static void main( String
args[] )
{
int sum = 0;
for ( int
number = 2; number <= 100; number += 2 )
sum += number;
JOptionPane.showMessageDialog( null,
"The sum is " + sum,
"Sum Even Integers from 2 to 100",
JOptionPane.INFORMATION_MESSAGE );
System.exit( 0
); // terminate the application
}
}
// Calculating compound interest
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
import javax.swing.JTextArea;
public class Interest
{
public static void main( String
args[] )
{
double amount,
principal = 1000.0, rate = .05;
DecimalFormat
precisionTwo = new DecimalFormat( "0.00" );
JTextArea
outputTextArea = new JTextArea( 11, 20 );
outputTextArea.append( "Year\tAmount on deposit\n" );
for ( int year
= 1; year <= 10; year++ )
{
amount = principal * Math.pow( 1.0 + rate, year );
outputTextArea.append( year + "\t" +
precisionTwo.format( amount ) + "\n" );
}
JOptionPane.showMessageDialog(
null, outputTextArea, "Compound Interest",
JOptionPane.INFORMATION_MESSAGE );
System.exit( 0
); // terminate the application
}
}
do while
class WhileLoops
{
public static void main(String[] args)
{
int temperature = 50;
do
{
System.out.println("Temperature is less than 55");
temperature =
temperature + 1;
}
while (temperature < 55);
}
}
if-else
if (Boolean)
{
statement;
}
else
{
statement;
}
