I'm developing a Java Sleep Cycle Calculator Application using Swing and AWT components, but I'm stuck here.
I'm using integer variables a and b to store the 'hour' and 'minute' values of time the user sets on the Scrollbar, which I'll use later to do some calculations and display some data.
But the value of a and b are automatically being set to 0, and the calculations are being done without waiting for the adjustment event on the scrollbar to be performed.
How to update the values of a and b after the event is performed and then use them for my calculations ?
this is where I'm setting the time a=23 and b=41
but the calculations are performed with values a=0 and b=0
Here is the Code :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class Sleep {
JFrame f;
JButton b1;
JLabel l3;
JLabel l4;
JLabel l5;
JLabel l6;
JButton b2;
JLabel l7;
JButton b3;
int a,b;
Sleep() {
f=new JFrame();
JPanel p2=new JPanel();
l3=new JLabel();
l3.setText("***************** RAZHA'S SLEEP CYCLE CALCULATOR *****************");
l4=new JLabel();
l4.setText("Tired of waking up exhausted ???");
l5=new JLabel("This Application calculates sleep cycles and finds the best time to wake up");
l6=new JLabel("Waking you up at the most perfect time, feeling rested!");
p2.add(l3); p2.add(l4); p2.add(l5); p2.add(l6);
p2.setBounds(700,100,500,100);
b1=new JButton("I WANT TO SLEEP AT");
b1.setBounds(800,350,300,150);
JPanel p1=new JPanel();
JLabel l1=new JLabel("Select Time (HH-MM)");
final JLabel label1 = new JLabel();
label1.setHorizontalAlignment(JLabel.CENTER);
label1.setSize(400,100);
final JLabel label2 = new JLabel();
label2.setHorizontalAlignment(JLabel.CENTER);
label2.setSize(400,100);
final JScrollBar hour=new JScrollBar(JScrollBar.VERTICAL, 2, 0, 0, 23);
final JScrollBar min=new JScrollBar(JScrollBar.VERTICAL, 2, 0, 0, 59);
hour.addAdjustmentListener(new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent e) {
final int c=hour.getValue();
label1.setText("Hours : "+ c);
System.out.println("hr "+c);
a=c;
}
});
min.addAdjustmentListener(new AdjustmentListener() {
public void adjustmentValueChanged(AdjustmentEvent e) {
final int d=min.getValue();
label2.setText("Minutes : "+ d);
System.out.println("min "+d);
b=d;
}
});
p1.add(l1); p1.add(hour); p1.add(min); p1.add(label1); p1.add(label2);
p1.setBounds(780,550,340,80);
l7=new JLabel("THE BEST TIMES TO WAKE UP ARE : ");
DefaultListModel<String> lx = new DefaultListModel<>();
lx.addElement(((a+1)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 1 hr 44 min");
lx.addElement(((a+3)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 3 hrs 14 min");
lx.addElement(((a+4)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 4 hrs 44 min");
lx.addElement(((a+6)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 6 hrs 14 min");
lx.addElement(((a+7)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 7 hrs 44 min");
lx.addElement(((a+9)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 9 hrs 14 min");
lx.addElement(((a+10)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 10 hrs 44 min");
lx.addElement(((a+12)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 12 hrs 14 min");
JList<String> list = new JList<>(lx);
list.setFixedCellHeight(48);
list.setFixedCellWidth(200);
JPanel p3=new JPanel();
p3.setBounds(800,350,300,420);
p3.add(l7);
p3.add(list);
p3.setVisible(false);
b3=new JButton("EXIT");
b3.setBounds(900,800,100,50);
b3.setVisible(false);
b3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
b2=new JButton("SUBMIT");
b2.setBounds(900,650,100,50);
b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
b2.setVisible(false);
b1.setVisible(false);
p1.setVisible(false);
p3.setVisible(true);
b3.setVisible(true);
}
});
f.add(b1);
f.add(b2);
f.add(p1);
f.add(p2);
f.add(p3);
f.add(b3);
f.setSize(400,400);
f.getContentPane().setBackground(Color.BLUE);
f.setLayout(null);
f.setVisible(true);
}
public static void main(String args[])
{
new Sleep();
}
}
Please help me out.
The JList component is initialized once with a ListModel that is created when a and b are zero. When the values of a and b change at a later point in time, the list model is not changed automatically. The JList component needs to be explicitly updated with a new model when the user clicks the submit button (b2).
Something like this:
Sleep() {
// [...]
l7=new JLabel("THE BEST TIMES TO WAKE UP ARE : ");
JList<String> list = new JList<>();
updateTimesListModel(list);
list.setFixedCellHeight(48);
list.setFixedCellWidth(200);
// [...]
b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
updateTimesListModel(list);
b2.setVisible(false);
b1.setVisible(false);
p1.setVisible(false);
p3.setVisible(true);
b3.setVisible(true);
}
});
// [...]
}
private void updateTimesListModel(JList<String> list) {
DefaultListModel<String> lx = new DefaultListModel<>();
lx.addElement(((a+1)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 1 hr 44 min");
lx.addElement(((a+3)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 3 hrs 14 min");
lx.addElement(((a+4)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 4 hrs 44 min");
lx.addElement(((a+6)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 6 hrs 14 min");
lx.addElement(((a+7)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 7 hrs 44 min");
lx.addElement(((a+9)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 9 hrs 14 min");
lx.addElement(((a+10)+(b+44)/60)+":"+((b+44)%60)+" - "+"Nap for 10 hrs 44 min");
lx.addElement(((a+12)+(b+14)/60)+":"+((b+14)%60)+" - "+"Nap for 12 hrs 14 min");
list.setModel(lx);
}