Java将整数转换为字符串并计算它
Java将整数转换为字符串并计算它
提问于 2013-09-11 16:32:00
有谁能向我解释一下为什么我的作业不断调整1.0的值，我问我的老师，他告诉我：“在这门语言里，我不记得语言是非常相似的--.你不应该学这个，因为你是在java 1而不是java 2”.不管怎么说，我试着取得成功并自学。
/**
* Author Rich Talcik, Do not Edit or modify
* Homework assignment2
* 09/11/13
* Problem 2.7 page 109
*
*/
private static final long serialVersionUID = 1L;
JLabel jlabel;
JFrame frame = new JFrame("home work");
JTextField tfAnswer = new JTextField("Click to find travel Time");
JTextField tfSpeed = new JTextField("Remvoe Text & Enter Speed here");
JTextField tfDistance = new JTextField("Remove Text & Enter Distance Here");
float dSpeed;
float dDistance;
String sTotal;
String sSpeed;
String sDistance;
public shapeDrawing() {
super(new BorderLayout());
JButton button = new JButton("Calculate my Travel Time");
//Converting the speed to an Integer from a String
button.addActionListener(this);
tfSpeed.addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent e) {
// TODO Auto-generated method stub
tfSpeed.setText("");
}
@Override
public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent e) {
// TODO Auto-generated method stub
}
});
tfDistance.addMouseListener(new MouseListener() {
@Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
tfDistance.setText("");
tfAnswer.setText("");
}
@Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
});
add(tfSpeed, BorderLayout.AFTER_LINE_ENDS);
add(tfDistance, BorderLayout.LINE_START);
add(tfAnswer, BorderLayout.PAGE_END);
add(button, BorderLayout.PAGE_START);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
}
public void actionPerformed(ActionEvent e) {
sSpeed = tfSpeed.getText();
dSpeed = Integer.valueOf(sSpeed);
//Converting Distance to integer from string
sDistance = tfSpeed.getText();
dDistance = Integer.valueOf(sDistance);
final float fTotal = (dDistance / dSpeed);
tfAnswer.setText(String.valueOf(fTotal));
}有人能解释为什么tfAnswer.setText总是返回1.0的值吗？
回答 2
Stack Overflow用户
回答已采纳
发布于 2013-09-11 16:38:35
你应该读tfDistance而不是tfSpeed
sSpeed = tfSpeed.getText();
dSpeed = Integer.valueOf(sSpeed);
//Converting Distance to integer from string
sDistance = tfSpeed.getText(); //!!! copy-past error
dDistance = Integer.valueOf(sDistance); 应该是
sSpeed = tfSpeed.getText();
dSpeed = Integer.valueOf(sSpeed);
//Converting Distance to integer from string
sDistance = tfDistance.getText();
dDistance = Integer.valueOf(sDistance); Stack Overflow用户
发布于 2013-09-11 16:36:18
基本上，您仍然将整数除以整数(然后将整数转换为浮点数)。试一试：
// Multiplying by 1.0 casts that answer to a float, so the
// division by dSpeed will also result in a float.
float fTotal = (1.0 * dDistance) / dSpeed;页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/18746603
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