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Java
Hello World Program:
class Hello
{
public static void main ( String[] args )
{
System.out.println("Hello World!");
}
}
Variables
class Hello
{
public static void main ( String[] args )
{
String junk = "test";
long payAmount = 123;
}
}
Arithmetic Operators
Output
class Hello
{
public static void main ( String[] args )
{
String junk = "test";
long payAmount = 123;
System.out.println(inData + payAmount );
}
}
Input
import java.io.*;
class Echo
{
public static void main (String[] args) throws IOException
{
InputStreamReader inStream =
new InputStreamReader( System.in ) ;
BufferedReader stdin =
new BufferedReader( inStream );
String inData;
String inData2;
System.out.println("Enter the data:");
inData = stdin.readLine();
System.out.println("You entered:" + inData );
System.out.println("Enter the data2:");
inData2 = stdin.readLine();
System.out.println("You entered:" + inData2 );
}
}
If
import java.io.*;
class NumberTester
{
public static void main (String[] args) throws IOException
{
BufferedReader stdin =
new BufferedReader ( new InputStreamReader( System.in ) );
String inData;
int num;
System.out.println("Enter an integer:");
inData = stdin.readLine();
num = Integer.parseInt( inData ); // convert inData to int
if ( num < 0 ) // is num less than zero?
System.out.println("The number " + num + " is negative"); // true-branch
else
System.out.println("The number " + num + " is positive"); // false-branch
System.out.println("Good-bye for now"); // always executed
}
}
While
class LoopExample
{
public static void main (String[] args )
{
int count = 1; // start count out at one
while ( count <= 3 ) // loop while count is <= 3
{
System.out.println( "count is:" + count );
count = count + 1; // add one to count
}
System.out.println( "Done with the loop" );
}
}
Arrays
class arrayEg1
{
public static void main ( String[] args )
{
int[] stuff = new int[5];
stuff[0] = 23;
stuff[1] = 38;
stuff[2] = 7*2;
System.out.println("stuff[0] has " + stuff[0] );
System.out.println("stuff[1] has " + stuff[1] );
System.out.println("stuff[2] has " + stuff[2] );
System.out.println("stuff[3] has " + stuff[3] );
System.out.println("stuff[4] has " + stuff[4] );
}
}
Reference:
Java Programming
