数组初始化在正确的位置，其他一切看起来都很好。我只是想不通为什么当我打印完成的数组时它会使所有元素都相同。
当我调试它时，它将新元素存储在数组上的新位置，但它不会创建该对象的新实例。
数组初始化：
public class CalcFrame implements ActionListener
{
private static Calculation[] calc_array = new Calculation[10];
行动......
if(ae.getSource() == calc_answer_position)
{
calc_array[count] = new Calculation();
calc_array[count].setIntVel(Double.parseDouble(init_vel_tf.getText()));
calc_array[count].setIntPos(Double.parseDouble(init_pos_tf.getText()));
calc_array[count].setAccel(Double.parseDouble(acc_tf.getText()));
calc_array[count].setTime(Double.parseDouble(time_tf.getText()));
double ans = getArray(count).calcPosition(getArray(count).getIntVel(),
getArray(count).getIntPos(), getArray(count).getAccel(),
getArray(count).getTime());
count++;
int n = JOptionPane.showOptionDialog(null, "Position x(t) = " + ans,
"Answer: Calculate Position", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.YES_OPTION)
{
frame.dispose();
}
if (n == JOptionPane.NO_OPTION)
{
System.exit(0);
}
}
计算类......编辑
public class Calculation
{
//These are the attributes for the Variables object.
private static double initial_accel = 0.0,
initial_velocity = 0.0,
initial_position = 0.0,
acceleration = 0.0,
velocity = 0.0,
position = 0.0,
time = 0.0,
height = 0.0,
mass = 0.0,
weight = 0.0,
answer = 0.0;
public Calculation() {}
public Calculation(double initial_velocity, double initial_position, double acceleration, double time)
{
setIntVel(initial_velocity);
setIntPos(initial_position);
setAccel(acceleration);
setTime(time);
}
public Calculation(double initial_velocity, double initial_position, double acceleration, double time, double position)
{
setIntVel(initial_velocity);
setIntPos(initial_position);
setAccel(acceleration);
setPos(position);
setTime(0);
}
public static double calcPosition(double in_vel, double in_pos, double acc, double time)
{
//x(t) = xi + vi(t) + .5(a)t^2
double answer = .5 * time * time * acc;
answer = (in_pos + (in_vel * time) + answer);
return answer;
}
public static double calcTime(double in_vel, double in_pos, double acc, double pos)
{
//t = (-vi + sqrt(vi^2 - 2(a)xi)) / a
double answer = (in_vel * in_vel) - (2 * acc * (in_pos - pos));
answer = ((-1 * in_vel) + Math.sqrt(answer)) / (acc);
return answer;
}
//===MUTATORS===//
public void setIntAccel(double initial_accel)
{
this.initial_accel = initial_accel;
}
public void setIntVel(double initial_velocity)
{
this.initial_velocity = initial_velocity;
}
public void setIntPos(double initial_position)
{
this.initial_position = initial_position;
}
public void setAccel(double acceleration)
{
this.acceleration = acceleration;
}
public void setVel(double velocity)
{
this.velocity = velocity;
}
public void setPos(double position)
{
this.position = position;
}
public void setTime(double time)
{
this.time = time;
}
public void setHeight(double height)
{
this.height = height;
}
public void setMass(double mass)
{
this.mass = mass;
}
public void setWeight(double weight)
{
this.weight = weight;
}
public void setAnswer(double answer)
{
this.answer = answer;
}
//===ACCESSORS===//
public double getIntAccel()
{
return initial_accel;
}
public double getIntVel()
{
return initial_velocity;
}
public double getIntPos()
{
return initial_position;
}
public double getAccel()
{
return acceleration;
}
public double getVel()
{
return velocity;
}
public double getPos()
{
return position;
}
public double getTime()
{
return time;
}
public double getHeight()
{
return height;
}
public double getMass()
{
return mass;
}
public double getWeight()
{
return weight;
}
public double getAnswer()
{
return answer;
}
public String toString()
{
String result = "Initial Position: " + getIntPos();
result += "\nAcceleration: " + getAccel();
result += "\nInitial Velocity: " + getIntVel();
result += "\nPosition: " + getPos();
result += "\nTime: " + getTime();
return result;
}
}
CalcFrame类...编辑
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JFrame;
public class CalcFrame implements ActionListener
{
private static Calculation[] calc_array = new Calculation[10];
private JLabel init_vel_label,
init_pos_label,
acc_label,
time_label,
pos_label;
private JButton calc_answer_time,
calc_answer_position;
private static JFrame frame;
private JTextField init_vel_tf,
init_pos_tf,
acc_tf,
time_tf,
pos_tf;
private static int count = 0;
//-----------------------------------------------------------------
// Constructor: Sets up the main GUI components.
//-----------------------------------------------------------------
public CalcFrame(int operation)
{
if(operation == 2)
CalcTime();
if(operation == 1)
CalcPosition();
}
public void CalcTime()
{
frame = new JFrame ("Quadratic Calculator");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
init_vel_label = new JLabel ("Initial Velocity");
init_pos_label = new JLabel ("Initial Position");
acc_label = new JLabel ("Acceleration");
pos_label = new JLabel ("Position at time (t)");
//textfields
init_vel_tf = new JTextField (10);
init_pos_tf = new JTextField (10);
acc_tf = new JTextField (10);
pos_tf = new JTextField (10);
//button
calc_answer_time = new JButton("Calculate");
calc_answer_time.addActionListener(this);
frame.add (init_vel_label);
frame.add (init_vel_tf);
frame.add (init_pos_label);
frame.add (init_pos_tf);
frame.add (acc_label);
frame.add (acc_tf);
frame.add (pos_label);
frame.add (pos_tf);
frame.add (calc_answer_time);
frame.setSize(new Dimension(200, 275));
frame.pack();
frame.setResizable(false);
frame.setLocation((d.width/2)-380, (d.height/2)-200);
frame.setVisible(true);
frame.setBackground (new Color(0,0,156));
frame.getContentPane();
}
public void CalcPosition()
{
frame = new JFrame ("Quadratic Calculator");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
init_vel_label = new JLabel ("Initial Velocity");
init_pos_label = new JLabel ("Initial Position");
acc_label = new JLabel ("Acceleration");
time_label = new JLabel ("Time (or change in time)");
//textfields
init_vel_tf = new JTextField (10);
init_pos_tf = new JTextField (10);
acc_tf = new JTextField (10);
time_tf = new JTextField (10);
//button
calc_answer_position = new JButton("Calculate");
calc_answer_position.addActionListener(this);
frame.add (init_vel_label);
frame.add (init_vel_tf);
frame.add (init_pos_label);
frame.add (init_pos_tf);
frame.add (acc_label);
frame.add (acc_tf);
frame.add (time_label);
frame.add (time_tf);
frame.add (calc_answer_position);
frame.setSize(new Dimension(200, 275));
frame.pack();
frame.setResizable(false);
frame.setLocation((d.width/2)-380, (d.height/2)-200);
frame.setVisible(true);
frame.setBackground (new Color(0,0,156));
frame.getContentPane();
}
public static void sort()
{
int i = 0;
int j = 0;
Calculation k;
for(i = getSize() - 1; i >= 0; i--)
{
for(j = 0; j <= i - 1; j++)
{
if(getArray(j).getIntVel() > getArray(j + 1).getIntVel())
{
k = getArray(j);
setArray(j, getArray(j + 1));
setArray(j + 1, k);
}
}
}
}
public static Calculation getArray(int i)
{
return calc_array[i];
}
public static Calculation[] getEntireArray()
{
return calc_array;
}
public static void setArray(int i, Calculation c)
{
calc_array[i] = c;
}
public static int getSize()
{
return count;
}
public void actionPerformed(ActionEvent ae)
{
Object[] options = {"Main Menu",
"Exit"};
if(ae.getSource() == calc_answer_position)
{
calc_array[count] = new Calculation();
calc_array[count].setIntVel(Double.parseDouble(init_vel_tf.getText()));
calc_array[count].setIntPos(Double.parseDouble(init_pos_tf.getText()));
calc_array[count].setAccel(Double.parseDouble(acc_tf.getText()));
calc_array[count].setTime(Double.parseDouble(time_tf.getText()));
double ans = getArray(count).calcPosition(getArray(count).getIntVel(),
getArray(count).getIntPos(), getArray(count).getAccel(),
getArray(count).getTime());
count++;
int n = JOptionPane.showOptionDialog(null, "Position x(t) = " + ans,
"Answer: Calculate Position", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.YES_OPTION)
{
frame.dispose();
}
if (n == JOptionPane.NO_OPTION)
{
System.exit(0);
}
}
if(ae.getSource() == calc_answer_time)
{
calc_array[count] = new Calculation(Double.parseDouble(init_vel_tf.getText()),
Double.parseDouble(init_pos_tf.getText()), Double.parseDouble(acc_tf.getText()),
0, Double.parseDouble(pos_tf.getText()));
double ans = getArray(count).calcTime(getArray(count).getIntVel(), getArray(count).getIntPos(), getArray(count).getAccel(), getArray(count).getPos());
count++;
int n = JOptionPane.showOptionDialog(null, "Time t = " + ans, "Answer: Calculate Time", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.YES_OPTION)
{
frame.dispose();
}
if (n == JOptionPane.NO_OPTION)
{
System.exit(0);
}
}
}
}
我认为这就是问题所需要的全部内容，如果您需要更多信息，请告诉我，我会待命。
再次感谢您
更新后的代码......
唯一修复的是删除Calculation类中的静态关键字以及对数组的调用的更改。
示例：
getArray(j).getIntVel() changed to ... calc_array[j].getIntVel()
计算类已更新......
public class Calculation
{
//These are the attributes for the Variables object.
private double initial_accel = 0.0,
initial_velocity = 0.0,
initial_position = 0.0,
acceleration = 0.0,
velocity = 0.0,
position = 0.0,
time = 0.0,
height = 0.0,
mass = 0.0,
weight = 0.0,
answer = 0.0;
public Calculation() {}
public Calculation(double initial_velocity, double initial_position, double acceleration, double time)
{
setIntVel(initial_velocity);
setIntPos(initial_position);
setAccel(acceleration);
setTime(time);
}
public Calculation(double initial_velocity, double initial_position, double acceleration, double time, double position)
{
setIntVel(initial_velocity);
setIntPos(initial_position);
setAccel(acceleration);
setPos(position);
setTime(0);
}
public double calcPosition(double in_vel, double in_pos, double acc, double time)
{
//x(t) = xi + vi(t) + .5(a)t^2
double answer = .5 * time * time * acc;
answer = (in_pos + (in_vel * time) + answer);
return answer;
}
public double calcTime(double in_vel, double in_pos, double acc, double pos)
{
//t = (-vi + sqrt(vi^2 - 2(a)xi)) / a
double answer = (in_vel * in_vel) - (2 * acc * (in_pos - pos));
answer = ((-1 * in_vel) + Math.sqrt(answer)) / (acc);
return answer;
}
//===MUTATORS===//
public void setIntAccel(double initial_accel)
{
this.initial_accel = initial_accel;
}
public void setIntVel(double initial_velocity)
{
this.initial_velocity = initial_velocity;
}
public void setIntPos(double initial_position)
{
this.initial_position = initial_position;
}
public void setAccel(double acceleration)
{
this.acceleration = acceleration;
}
public void setVel(double velocity)
{
this.velocity = velocity;
}
public void setPos(double position)
{
this.position = position;
}
public void setTime(double time)
{
this.time = time;
}
public void setHeight(double height)
{
this.height = height;
}
public void setMass(double mass)
{
this.mass = mass;
}
public void setWeight(double weight)
{
this.weight = weight;
}
public void setAnswer(double answer)
{
this.answer = answer;
}
//===ACCESSORS===//
public double getIntAccel()
{
return initial_accel;
}
public double getIntVel()
{
return initial_velocity;
}
public double getIntPos()
{
return initial_position;
}
public double getAccel()
{
return acceleration;
}
public double getVel()
{
return velocity;
}
public double getPos()
{
return position;
}
public double getTime()
{
return time;
}
public double getHeight()
{
return height;
}
public double getMass()
{
return mass;
}
public double getWeight()
{
return weight;
}
public double getAnswer()
{
return answer;
}
public String toString()
{
String result = "Initial Position: " + getIntPos();
result += "\nAcceleration: " + getAccel();
result += "\nInitial Velocity: " + getIntVel();
result += "\nPosition: " + getPos();
result += "\nTime: " + getTime();
return result;
}
}
CalcFrame类已更新...
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JFrame;
public class CalcFrame implements ActionListener
{
private static Calculation[] calc_array = new Calculation[10];
private JLabel init_vel_label,
init_pos_label,
acc_label,
time_label,
pos_label;
private JButton calc_answer_time,
calc_answer_position;
private static JFrame frame;
private JTextField init_vel_tf,
init_pos_tf,
acc_tf,
time_tf,
pos_tf;
private static int count = 0;
//-----------------------------------------------------------------
// Constructor: Sets up the main GUI components.
//-----------------------------------------------------------------
public CalcFrame(int operation)
{
if(operation == 2)
CalcTime();
if(operation == 1)
CalcPosition();
}
public void CalcTime()
{
frame = new JFrame ("Quadratic Calculator");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
init_vel_label = new JLabel ("Initial Velocity");
init_pos_label = new JLabel ("Initial Position");
acc_label = new JLabel ("Acceleration");
pos_label = new JLabel ("Position at time (t)");
//textfields
init_vel_tf = new JTextField (10);
init_pos_tf = new JTextField (10);
acc_tf = new JTextField (10);
pos_tf = new JTextField (10);
//button
calc_answer_time = new JButton("Calculate");
calc_answer_time.addActionListener(this);
frame.add (init_vel_label);
frame.add (init_vel_tf);
frame.add (init_pos_label);
frame.add (init_pos_tf);
frame.add (acc_label);
frame.add (acc_tf);
frame.add (pos_label);
frame.add (pos_tf);
frame.add (calc_answer_time);
frame.setSize(new Dimension(200, 275));
frame.pack();
frame.setResizable(false);
frame.setLocation((d.width/2)-380, (d.height/2)-200);
frame.setVisible(true);
frame.setBackground (new Color(0,0,156));
frame.getContentPane();
}
public void CalcPosition()
{
frame = new JFrame ("Quadratic Calculator");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.setLayout(new FlowLayout());
Toolkit tk = Toolkit.getDefaultToolkit();
Dimension d = tk.getScreenSize();
init_vel_label = new JLabel ("Initial Velocity");
init_pos_label = new JLabel ("Initial Position");
acc_label = new JLabel ("Acceleration");
time_label = new JLabel ("Time (or change in time)");
//textfields
init_vel_tf = new JTextField (10);
init_pos_tf = new JTextField (10);
acc_tf = new JTextField (10);
time_tf = new JTextField (10);
//button
calc_answer_position = new JButton("Calculate");
calc_answer_position.addActionListener(this);
frame.add (init_vel_label);
frame.add (init_vel_tf);
frame.add (init_pos_label);
frame.add (init_pos_tf);
frame.add (acc_label);
frame.add (acc_tf);
frame.add (time_label);
frame.add (time_tf);
frame.add (calc_answer_position);
frame.setSize(new Dimension(200, 275));
frame.pack();
frame.setResizable(false);
frame.setLocation((d.width/2)-380, (d.height/2)-200);
frame.setVisible(true);
frame.setBackground (new Color(0,0,156));
frame.getContentPane();
}
public static void sort()
{
int i = 0;
int j = 0;
Calculation k;
for(i = count - 1; i >= 0; i--)
{
for(j = 0; j <= i - 1; j++)
{
if(calc_array[j].getIntVel() > calc_array[j+1].getIntVel())
{
k = calc_array[j];
calc_array[j] = calc_array[j+1];
calc_array[j + 1] = k;
}
}
}
}
public static Calculation getArray(int i)
{
return calc_array[i];
}
public Calculation[] getEntireArray()
{
return calc_array;
}
public void setArray(int i, Calculation c)
{
calc_array[i] = c;
}
public static int getSize()
{
return count;
}
public void actionPerformed(ActionEvent ae)
{
Object[] options = {"Main Menu",
"Exit"};
if(ae.getSource() == calc_answer_position)
{
calc_array[count] = new Calculation();
calc_array[count].setIntVel(Double.parseDouble(init_vel_tf.getText()));
calc_array[count].setIntPos(Double.parseDouble(init_pos_tf.getText()));
calc_array[count].setAccel(Double.parseDouble(acc_tf.getText()));
calc_array[count].setTime(Double.parseDouble(time_tf.getText()));
double ans = getArray(count).calcPosition(getArray(count).getIntVel(),
getArray(count).getIntPos(), getArray(count).getAccel(),
getArray(count).getTime());
count++;
int n = JOptionPane.showOptionDialog(null, "Position x(t) = " + ans,
"Answer: Calculate Position", JOptionPane.YES_NO_OPTION,
JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.YES_OPTION)
{
frame.dispose();
}
if (n == JOptionPane.NO_OPTION)
{
System.exit(0);
}
}
if(ae.getSource() == calc_answer_time)
{
calc_array[count] = new Calculation(Double.parseDouble(init_vel_tf.getText()),
Double.parseDouble(init_pos_tf.getText()), Double.parseDouble(acc_tf.getText()),
0, Double.parseDouble(pos_tf.getText()));
double ans = getArray(count).calcTime(getArray(count).getIntVel(), getArray(count).getIntPos(), getArray(count).getAccel(), getArray(count).getPos());
count++;
int n = JOptionPane.showOptionDialog(null, "Time t = " + ans, "Answer: Calculate Time", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, options, options[0]);
if (n == JOptionPane.YES_OPTION)
{
frame.dispose();
}
if (n == JOptionPane.NO_OPTION)
{
System.exit(0);
}
}
}
}
答案 0 :(得分：4)
你能提供计算类吗？这可能是一个静态问题
编辑：
确定尝试在变量声明中删除static
那里
//These are the attributes for the Variables object.
private **static** double initial_accel = 0.0,
您还必须删除那些变量出现的所有方法的静态
认为静态变量和/或方法是独立的，它们不依赖于当前实例，这意味着任何静态属性在同一个实例的对象之间总是相同的，你甚至可以依赖这些属性没有实例
Person person1 = new Person();
person1.name = "User";
Person person2 = new Person()
person2.name = "Admin";
如果name是static，则person1.name将始终为person2.name，否则它们将具有自己的名称
答案 1 :(得分：2)
您是否在代码中的任何位置调用方法sort（）。因为我看到下面的内部排序方法
setArray(j, getArray(j + 1));
setArray(j + 1, k);
因为对于Calculation k;，您通过getArray(int i)方法从数组中分配引用。因为你正在玩引用可能会发生在这里。这只是猜测。