public class Basic''''''Emulator {
	
	static void GOTO( int linenumber ) {
		switch( linenumber ) {
			case 10: System.out.println( "Hello, World" );
			case 20: GOTO( 10 );
		}
	}

	public static void main( String[] args ) {
		GOTO( 10 );
	}
	
 }


Please note that the fall-through feature of the switch-statement is actually necessary here.

----

''The above code will result in a stack overflow. Try this:''

 import java.util.*;
 
 public abstract class Basic''''''Emulator {
 
   public interface Command { void run(); }
 
   private int currentLine = 0;
   private Sorted''''''Map<Integer, Command> commands = new Tree''''''Map<Integer, Command>();
   
   public Command PRINT(final String value) {
     return new Command() {
       public void run() { System.out.println(value); }
     };
   }
   public Command GOTO(final int value) {
     return new Command() {
       public void run() { currentLine = value - 1; }
     };
   }
 	
   public void line(int line, Command command) {
     commands.put(line, command);
   }    
 	
   public void execute() {
     //lines();
     int maxCommand = 0;
     try {
       maxCommand = commands.lastKey();
     catch (Exception e) {}

     for (currentLine=0; currentLine <= maxCommand; currentLine++) {
       Command command = commands.get(currentLine);
       if (command != null) command.run();
     }
   }
   	
   public static void main(String[] args) {
     new Basic''''''Emulator() {{
         line(10, PRINT("Hello, World!"));
         line(20, GOTO(10));
     }}.execute();
   }
 }

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CategoryJava CategoryLanguageImplementation