자바에서 JTextField 내부의 일반 텍스트

Question

JTextField의 모든 텍스트를 지우는 "Clear"라는 JButton이있는 BMI 계산기 프로젝트에서 작업 중입니다. feetText.setText(""); 시도했지만 작동하지 않았다. 내가 뭘 할 수 있을까?

import java.awt.*; 
    import java.awt.event.*; 
    import javax.swing.*; 

    public class BMI extends JFrame implements ActionListener { 
     public static void main(String[] args) { 
      BMI runner = new BMI(); 
      runner.setSize(450, 600); 
      runner.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
      runner.setVisible(true); 
     } 

     JTextField feetText, inchesText, weightText, waistText, neckText, hipsText; 
     JLabel feet, height,weightLabel, pounds, waist, neck, gender, maleLabel, femaleLabel; 
     JLabel inches, inches2, inches3, inches4, info1, info2, info3, info4; 
     JLabel activityLevel, sedentaryLabel, moderateLabel, activeLabel; 
     JLabel bmi, ratio, pbf, hips, lbm; 
     JRadioButton male, female, sedentary, moderate, active; 
     JPanel panel1, panel2, panel3, panel4, panel5, panel6, panel7, panel8; 
     JPanel panel9, panel10, panel11, panel12, panel13, panel14, panel15; 
     JButton clear, calculate; 
     Font font, font2, font3, font4; 
     double getBMI; 
     double roundedWTHR; 
     JLabel one, two; 

     public BMI() { 
      JFrame f = new JFrame("BMI and Body Fat Calculator"); 
      f.setSize(450, 600); 
      f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

      //Initialize the panels and set their layout 

      panel1 = new JPanel(); 
      panel1.setLayout(new FlowLayout()); 
      panel2 = new JPanel(); 
      panel2.setLayout(new FlowLayout()); 
      panel3 = new JPanel(); 
      panel3.setLayout(new FlowLayout()); 
      panel4 = new JPanel(); 
      panel4.setLayout(new FlowLayout()); 
      panel5 = new JPanel(); 
      panel5.setLayout(new FlowLayout()); 
      panel6 = new JPanel(); 
      panel6.setLayout(new FlowLayout()); 
      panel7 = new JPanel(); 
      panel7.setLayout(new FlowLayout()); 
      panel8 = new JPanel(); 
      panel8.setLayout(new FlowLayout()); 
      panel9 = new JPanel(); 
      panel9.setLayout(new FlowLayout()); 
      panel10 = new JPanel(); 
      panel10.setLayout(new FlowLayout()); 
      panel11 = new JPanel(); 
      panel11.setLayout(new FlowLayout()); 
      panel12 = new JPanel(); 
      panel12.setLayout(new FlowLayout()); 
      panel13 = new JPanel(); 
      panel13.setLayout(new FlowLayout()); 
      panel14 = new JPanel(); 
      panel14.setLayout(new FlowLayout()); 
      panel15 = new JPanel(); 
      panel15.setLayout(new FlowLayout()); 

      //Height 
      height = new JLabel("Height: "); 
      feetText = new JTextField(10); 
      feet = new JLabel(" Feet"); 
      inchesText = new JTextField(10); 
      inches = new JLabel("inches"); 

      feetText.setActionCommand("height"); 
      feetText.addActionListener(this); 

      //Weight 
      weightLabel = new JLabel("Weight: "); 
      weightText = new JTextField(10); 
      pounds = new JLabel(" pounds"); 

      //Waist 
      waist = new JLabel("Waist: "); 
      waistText = new JTextField(10); 
      inches2 = new JLabel("inches"); 

      //Neck 
      neck = new JLabel("Neck: "); 
      neckText = new JTextField(10); 
      inches3 = new JLabel("inches"); 

      //Hips 
      JLabel hips = new JLabel("Hips (Female): "); 
      hipsText = new JTextField(10);  
      inches4 = new JLabel("inches"); 

      //Gender 
      gender = new JLabel("Sex: "); 
      male = new JRadioButton(); 
      maleLabel = new JLabel("Male"); 
      female = new JRadioButton(); 
      femaleLabel = new JLabel("Female"); 

      //Level of activity 
      activityLevel = new JLabel("Level of Activity: "); 
      sedentary = new JRadioButton(); 
      sedentaryLabel = new JLabel("Sedentary"); 
      moderate = new JRadioButton(); 
      moderateLabel = new JLabel("Moderate"); 
      active = new JRadioButton(); 
      activeLabel = new JLabel("Active"); 

      //Clear and Calculate 
      clear = new JButton("Clear"); 
      calculate = new JButton("Calculate"); 

      calculate.addActionListener(this); 
      clear.setActionCommand("clear"); 

      //Body Mass Index 
      bmi = new JLabel("Body Mass Index: "); 
      font = new Font("Arial Black", Font.BOLD,12); 
      bmi.setFont(font); 

      //Waist-To-Height Ratio 
      ratio = new JLabel("Waist-To-Height Ratio: "); 
      font2 = new Font("Arial Black", Font.BOLD,12); 
      ratio.setFont(font2); 

      //Percentage Body Fat 
      pbf = new JLabel("Percentage Body Fat: "); 
      font3 = new Font("Arial Black", Font.BOLD,12); 
      pbf.setFont(font3); 

      //Lean Body Mass 
      lbm = new JLabel("Lean Body Mass: "); 
      font4 = new Font("Arial Black", Font.BOLD,12); 
      lbm.setFont(font4); 

      //Information 1 
      info1 = new JLabel(""); 

      //Information 2 
      info2 = new JLabel(""); 

      //Information 3 
      info3 = new JLabel(""); 

      //Information 4 
      info4 = new JLabel(""); 

      //Adding components to panel1 
      panel1.add(height); 
      panel1.add(feetText); 
      panel1.add(feet); 
      panel1.add(inchesText); 
      panel1.add(inches); 

      //Adding components to panel2 
      panel2.add(weightLabel); 
      panel2.add(weightText); 
      panel2.add(pounds); 

      //Adding components to panel3 
      panel3.add(waist); 
      panel3.add(waistText); 
      panel3.add(inches2); 

      //Adding components to panel4 
      panel4.add(neck); 
      panel4.add(neckText); 
      panel4.add(inches3); 

      //Adding components to panel5 
      panel5.add(hips); 
      panel5.add(hipsText); 
      panel5.add(inches4); 

      //Adding components to panel6 
      panel6.add(gender); 
      panel6.add(male); 
      panel6.add(maleLabel); 
      panel6.add(female); 
      panel6.add(femaleLabel); 

      /*The following code prohibits selecting 
      both the JRadioButtons selected at the same time*/ 

      ButtonGroup genderGroup = new ButtonGroup(); 
      genderGroup.add(male); 
      genderGroup.add(female); 

      //Adding components to panel7 
      panel7.add(activityLevel); 
      panel7.add(sedentary); 
      panel7.add(sedentaryLabel); 
      panel7.add(moderate); 
      panel7.add(moderateLabel); 
      panel7.add(active); 
      panel7.add(activeLabel); 

      /*The following code prohibits selecting 
      both the JRadioButtons selected at the same time*/ 

      ButtonGroup activityGroup = new ButtonGroup(); 
      activityGroup.add(sedentary); 
      activityGroup.add(moderate); 
      activityGroup.add(active); 

      //Adding components to panel8 
      panel8.add(clear); 
      panel8.add(calculate); 

      //Adding a component to panel9 
      panel9.add(bmi); 

      //Adding a component to panel10 
      panel10.add(ratio); 

      //Adding a component to panel11 
      panel11.add(pbf); 

      //Adding a component to panel12 
      panel12.add(lbm); 

      //Adding components to panel13 
      panel13.add(info1); 
      panel13.add(info2); 

      //Adding components to panel14 
      panel14.add(info3); 

      //Adding components to panel15 
      panel15.add(info4); 

      //Set the layout 
      BoxLayout boxLayout = new BoxLayout(getContentPane(), BoxLayout.Y_AXIS); 
      setLayout(boxLayout); 

      //Adding panels to the frame 
      add(panel1); 
      add(panel2); 
      add(panel3); 
      add(panel4); 
      add(panel5); 
      add(panel6); 
      add(panel7); 
      add(panel8); 
      add(panel9); 
      add(panel10); 
      add(panel11); 
      add(panel12); 
      add(panel13); 
      add(panel14); 
      add(panel15); 

      setVisible(true); 
     } 

     public void actionPerformed(ActionEvent event) { 
      double feet = Double.parseDouble(feetText.getText()); 
      double inches = Double.parseDouble(inchesText.getText()); 
      double weight = Double.parseDouble(weightText.getText()); 
      double waist = Double.parseDouble(waistText.getText()); 
      double neck = Double.parseDouble(neckText.getText()); 
      double hip = Double.parseDouble(hipsText.getText()); 

      double heightInInches = (feet * 12) + inches; 
      double heightInCm = (feet * 30.48) + (inches * 2.54); 

      if(event.getActionCommand().equals("clear")) { 
      feetText.setText(""); 
      } 

      //Calculating the Percentage Body Fat 
      if(male.isSelected()) { 
      double percentageBodyFat = 495/1.0324 - 0.19077 * (Math.log10(waist*2.54 - neck*2.54)) + 0.15456 * (Math.log10(feet*12*2.54 + inches*2.54)) - 450; 
      double pbfRounded = Math.round(percentageBodyFat * 10.0)/10.0; 
      pbf.setText("Percent Body Fat: " + pbfRounded); 
      } 

      if(female.isSelected()) { 
      double percentageBodyFat = (495/(1.29579-0.35004*Math.log10(waist*2.54+hip*2.54-neck*2.54) + 0.22100 * Math.log10(feet*12*2.54 + inches*2.54))-450); 
      double pbfRounded = Math.round(percentageBodyFat * 10.0)/10.0; 
      double bodyFatPercent = pbfRounded; 
      pbf.setText("Percent Body Fat: " + pbfRounded + "%"); 
      } 

      //Calculating the Body Mass Index 
      double bodyMassIndex = Math.round(703 * (weight/(heightInInches*heightInInches)*10.0))/10.0; 
      double getBMI = bodyMassIndex; 
      bmi.setText("Body Mass Index: " + bodyMassIndex + " kg/m²"); 

      //Calculating the Waist-To-Height Ratio 
      double wthr = waist/heightInInches; 
      double roundedWTHR = Math.round(wthr * 100.0)/100.0; 
      ratio.setText("Waist-To-Height Ratio: " + roundedWTHR); 

      //Calculating the Lean Body Mass 
      if(male.isSelected()) { 
      double leanBodyMass = (0.32810 * weight) + (0.33929 * heightInCm) - 29.5336; 
      double lbmRounded = Math.round(leanBodyMass * 10.0)/10.0; 
      lbm.setText("Lean Body Mass: " + lbmRounded + "lb"); 
      } 

      if(female.isSelected()) { 
      double leanBodyMass = (0.29569 * weight) + (0.41813 * heightInCm) - 43.2933; 
      double lbmRounded = Math.round(leanBodyMass * 10.0)/10.0; 
      lbm.setText("Lean Body Mass: " + lbmRounded + "lb"); 
      } 

      if(getBMI < 15) { 
      info1.setText("Your Bmi is severly low"); 
      info3.setText("You are severly underweight probably due to usual mass distributiuon"); 
      } else if(getBMI <= 16) { 
      info1.setText("Your Bmi is extremely low"); 
      info3.setText("You are extremely underweight probably due to usual mass distribution"); 
      } else if(getBMI <= 18.5) { 
      info1.setText("Your BMI is lower than usual"); 
      info3.setText("You may be underweight probably due to usual mass distribution"); 
      } else if(getBMI <= 25) { 
      info1.setText("Your BMI is normal"); 
      info3.setText("Your weight and mass distribution is normal"); 
      } else if(getBMI <= 30) { 
      info1.setText("Your BMI is greater than normal"); 
      info3.setText("You may be overweight or have unusual mass distribution"); 
      } else if(getBMI <=35) { 
      info1.setText("Your BMI is very much greater than normal"); 
      info3.setText("You are overweight or have unusual mass distribution"); 
      } else if(getBMI <= 39.9) { 
      info1.setText("Your BMI is severly greater than normal"); 
      info3.setText("You are extremely overweight or have unusual mass distribution"); 
      } else if(getBMI >= 40) { 
      info1.setText("Your BMI is extremely greater than normal"); 
      info3.setText("You are severly overweight or have unusual mass distribution"); 
      } 

      if(male.isSelected() && roundedWTHR < 0.35) { 
      info2.setText("and your weight-to-height ratio is severly low"); 
      } 
      else if(male.isSelected() && roundedWTHR <= 0.43) { 
      info2.setText("and your weight-to-height ratio is extremely low"); 
      } 
      else if(male.isSelected() && roundedWTHR <= 0.46) { 
      info2.setText("and your weight-to-height ratio is lower than normal"); 
      } 
      else if(male.isSelected() && roundedWTHR <= 0.53) { 
      info2.setText("but your weight-to-height ratio is normal"); 
      } 
      else if(male.isSelected() && roundedWTHR <= 0.58) { 
      info2.setText("and your weight-to-height ratio is a little higher than usual"); 
      } 
      else if(male.isSelected() && roundedWTHR <= 0.63) { 
      info2.setText("and your weight-to-height ratio is extremely higher than normal"); 
      } 
      else if(male.isSelected() && roundedWTHR > 0.63) { 
      info2.setText("and your weight-to-height ratio is severly higher than normal"); 
      } 

      if(female.isSelected() && roundedWTHR < 0.35) { 
      info2.setText("and your weight-to-height ratio is severly low"); 
      } 
      else if(female.isSelected() && roundedWTHR <= 0.42) { 
      info2.setText("and your weight-to-height ratio is extremely low"); 
      } 
      else if(female.isSelected() && roundedWTHR <= 0.46) { 
      info2.setText("and your weight-to-height ratio is lower than normal"); 
      } 
      else if(female.isSelected() && roundedWTHR <= 0.49) { 
      info2.setText("but your weight-to-height ratio is normal"); 
      } 
      else if(female.isSelected() && roundedWTHR <= 0.54) { 
      info2.setText("and your weight-to-height ratio is a little higher than usual"); 
      } 
      else if(female.isSelected() && roundedWTHR <= 0.58) { 
      info2.setText("and your weight-to-height ratio is extremely higher than normal"); 
      } 
      else if(female.isSelected() && roundedWTHR > 0.58) { 
      info2.setText("and your weight-to-height ratio is severly higher than normal"); 
      } 

      if(sedentary.isSelected()) { 
      info4.setText("Your diet should contain at least " + Math.round(0.36*weight) + " grams of protein per day."); 
      } 

      if(moderate.isSelected()) { 
      info4.setText("Your diet should contain at least " + Math.round(0.4*weight) + " grams of protein per day."); 
      } 

      if(active.isSelected()) { 
      info4.setText("Your diet should contain at least " + Math.round(0.5*weight) + " grams of protein per day."); 
      } 
     } 
    } 

Answer 1

전혀 신경 쓰지 않았습니다. 내 코드에 clear.addActionListener(this);을 추가하는 것을 잊어 버렸지 만 지금은 추가 했으므로 작동했습니다!

Answer 2

feetText.setText (null);

시도해주세요.