Appendix B - Some Example Kenya Programs and Their Translations to Java

Hello World

Kenya

print "Hello World!";

Java

package examples;

public class Program { 
 
  public static void main(String[] args) {
     System.out.print( "Hello World!" );
  }
}

Using Variables

Kenya

int a = 2;
int b = 3;
println a + b;

string h = "Hello";
println h;

Java

package examples;

public class Program {
  
  public static void main(String[] args) {

    int a = 2;
    int b = 3;
    System.out.println( a + b );
    String h = "Hello" ;
    System.out.println( h );
  }
}

Using Arrays

Kenya

int a[10];
a[1] = 5;
println a[1];

string b[2][2];

//arrays are indexed from zero
b[0][0] = "Hello";
println b[0][0];

Java

package examples;

public class Program {

  public static void main(String[] args)  {

    int [] a = new int [10];
    a[1] = 5;
    System.out.println( a[1] );
    String [][] b = new String [2][2];
    b[0][0] = "Hello" ;
    System.out.println( b[0][0] );
  }
}

Using a While Loop

Kenya

int i = 1;

while ( i <= 10 )
{
  println i;
  i = i + 1;
}

Java

package examples;

public class Program {
  
  public static void main(String[] args) {

    int i = 1;
    while ( i <= 10 )
    {
      System.out.println( i );
      i = i + 1;
    }
  }
}

Using a For Loop

Kenya

int i;

for i = 1 to 10 
{
  println i;
}

for i = 2 to 10 step 2
{
  println i;
}

for decreasing i = 10 to 2
{
  println i;
}

Java

package examples;

public class Program {
  
  public static void main(String[] args) {

    int i;

    for( i = 1; i <= 10; i ++ )
    {
      System.out.println( i );
    }
    
    for( i = 2; i <= 10; i += 2 )
    {
      System.out.println( i );
    }

    for( i = 10; i >= 2; i-- )
    {
      System.out.println( i );
    }
  }
}

Using a User Defined Data Type

Kenya

class Person
{
  string name;
  int age;
}

Person me;
me.name = "Robert";
me.age = 22;

println "My name is " + me.name;
println "I am " + me.age + " years old";

Java

package examples;

public class Program {
  
  public static void main(String[] args) {
    Person me = new Person();
    me.name = "Robert";
    me.age = 22;
    System.out.println( "My name is " + me.name );
    System.out.println( "I am " + me.age + " years old" );
  }
}

class Person
{
  String name;
  int age;
}

Using a Conditional

Kenya

int a = 2;

if ( a == 2 )
{
  println "a equals 2";
}
else
{
  println "a does not equal 2";
}

Java

package examples;

public class Program {
  
  public static void main(String[] args) {

    int a = 2;

    if ( a == 2 )
    {
      System.out.println( "a equals 2" );
    }
    else
    {
      System.out.println( "a does not equal 2" );
    }
  }
}

Using a Switch

int a = 2;

switch ( a )
{
  case 1  : { print "One";  break; }
  case 2  : { print "Two";  break; }
  default : { print "Many"; break; }
}

Java

package examples;

public class Program {
  
  public static void main(String[] args) {

    int a = 2;
    switch ( a ) {
      case 1: 
      {
        System.out.print( "One" );
        break;
      }
      case 2: 
      {
        System.out.print( "Two" );
        break;
      }
      default :
      {
        System.out.print( "Many" );
        break;
      }
    }
  }
}

Defining and Applying a Function

Kenya

// The definition 

int triple( int n )
{
  return n*3;
}

// The application

int a = 2;
int b = call triple( a );

Java

package examples;

public class Program {
  
  public static void main(String[] args) {

    int a = 2;
    int b = triple( a);
    }
  
  static int triple( int n ) { 
    return n * 3;
  } 
}