// A class that constructs a panel that can be used to experiment with the
// behavior of the "toUpperCase" method of the String class.

public class ToUpperTester extends StringInput implements StringOpTester {
    
    // Perform "toUpperCase" operation when requested
    public String doIt() {
        return "" + sourceField.getText().toUpperCase();
        
    }
    
    // Return the name of the method this class invokes
    public String toString() {
        return "toUpperCase";
    }
    
}