等价类划分方法及其示例（2）

package threebox;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.AnchorPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;



public class lab4 extends Application{
    public static void main(String[]args)
    {
        lab4.launch(args);
    }
    public void start(Stage primaryStage)
    {
        primaryStage.setTitle("Transition Lab");
        AnchorPane anchorpane = new AnchorPane();
        Button btn = new Button( );
        btn.setText("OK");
        AnchorPane.setTopAnchor(btn, 350.0);
        AnchorPane.setLeftAnchor(btn, 250.0);
    
        Text text = new Text("user name:");
        text.setFont(new Font(24));
        text.setFill(Color.BLACK);
        AnchorPane.setTopAnchor(text, 50.0);
        AnchorPane.setLeftAnchor(text, 50.0);
        final TextField textf = new TextField();
        AnchorPane.setTopAnchor(textf, 50.0);
        AnchorPane.setLeftAnchor(textf, 300.0);
        
        Text text2 = new Text("password:");
        text2.setFill(Color.BLACK);
        text2.setFont(new Font(24));
        AnchorPane.setTopAnchor(text2, 150.0);
        AnchorPane.setLeftAnchor(text2, 50.0);
        final TextField textf2 = new TextField();
        AnchorPane.setTopAnchor(textf2, 150.0);
        AnchorPane.setLeftAnchor(textf2, 300.0);
        
        Text text3 = new Text("verification code:");
        text3.setFill(Color.BLACK);
        text3.setFont(new Font(24));
        AnchorPane.setTopAnchor(text3, 250.0);
        AnchorPane.setLeftAnchor(text3, 50.0);
        text3.setX(50);
        text3.setY(250);
        final TextField textf3 = new TextField();
        AnchorPane.setTopAnchor(textf3, 250.0);
        AnchorPane.setLeftAnchor(textf3, 300.0);
        
        btn.setOnAction( new EventHandler<ActionEvent>( ) {
            public void handle(ActionEvent actEvt) {
                
                String sql1 = textf.getText();
                String sql2=new String();
                sql2=textf2.getText();
                String sql3=new String();
                sql3=textf3.getText();
                int length1=sql1.length();
                int length2=sql2.length();
                int length3=sql3.length();
                if((length1<7)&&(length1>0)&&(length2<7)&&(length2>0)&&(length3<7)&&(length3>0)){
                    System.out.println("the length is not enough");
                }  
                
                for(int i= 0;i<=length1;i++){
                if((sql1.charAt(i)<49)||((sql1.charAt(i)>54)&&(sql1.charAt(i)<65))||((sql1.charAt(i)>90)&&(sql1.charAt(i)<97))||(sql1.charAt(i)>122))
                {
                    System.out.println("not the real character");
                }
                }
                
                for(int i= 0;i<=length2;i++){
                if((sql2.charAt(i)<49)||((sql2.charAt(i)>54)&&(sql2.charAt(i)<65))||((sql2.charAt(i)>90)&&(sql2.charAt(i)<97))||(sql2.charAt(i)>122))
                {
                    System.out.println("not the real character");
                }
                }
                
                
                for(int i= 0;i<=length3;i++){
                if((sql3.charAt(i)<49)||((sql3.charAt(i)>54)&&(sql3.charAt(i)<65))||((sql3.charAt(i)>90)&&(sql3.charAt(i)<97))||(sql3.charAt(i)>122))
                {
                    System.out.println("not the real character");
                }
                }    
            }
            } );
        
        anchorpane.getChildren().addAll(btn, text,textf,text2,textf2,text3,textf3);
        primaryStage.setScene(new Scene(anchorpane, 550, 400));
        primaryStage.show();
    }

}

当换成三个框时的代码与界面如上，下面是测试用例：