1. This week's learning summary

1.1 Object oriented learning is over , Please use mind map , To encapsulate 、 Inherit 、 Draw a mind map for the core concept , Make a summary of the object-oriented thinking .

notes 1: No more keywords and content , But the connection between concepts needs to be clear , Content covers the core content of object-oriented .

notes 2: Less color 、 The connection should not be complicated , If necessary, explain it on the line .

1.2 Optional : Summarize other lessons in the usual way .

Reference material :

XMind

2. Written work

1.clone Method

1.1 Object Object clone The way is to be protected modification , Override... In a custom class clone What should we pay attention to when we do this ?

answer : Only within this class or with Object Use in the same package , It can't be used in other classes ; If you will protected Switch to public, Will narrow its limitations .

1.2 Design your own class , What kind of methods are generally used protected To embellish ? With homework Shape For example, .

answer : By protected The method of modification can be seen in this package , It is also visible to subclasses of the class where the method is located , But not accessible by external packages . stay Shape Abstract classes defined in Shape Abstract methods defined in getPerimeter and getArea Both can be used. protected To modify , To subclass Rectangle and Circle Is visible .

1.3 stay test1 Write simple Employee class , stay test2 Create a new one in the package TestProtected class , And in main Try calling test1 In bag Employee Of clone Method to clone a new object , The success of ? Why? ?

answer : Can't succeed , because Employee Classes and TestProtected Class is not in the same package . Can be Employee use public modification , Make other classes accessible .

2. Use anonymous classes and Lambda Expression rewriting problem set object oriented 2- Advanced - The topic of polymorphic interface inner class 5-2

Just paste the key code and running results , Don't make the picture too big .

Comparator<PersonSortable2> NameComparator = new Comparator<PersonSortable2>() {
public int compare(PersonSortable2 obj1,PersonSortable2 obj2) {
if (obj1.getName() .compareTo(obj2.getName()) > 0)
return 1;
else if (obj1.getName().compareTo(obj2.getName()) < 0)
return -1;
else
return 0;
}
}; Comparator<PersonSortable2> AgeComparator = new Comparator<PersonSortable2>() {
public int compare(PersonSortable2 obj1,PersonSortable2 obj2) {
if (obj1.getAge() > obj2.getAge())
return 1;
else if (obj1.getAge() < obj2.getAge())
return -1;
else
return 0;
}
};

Lambda expression

Comparator<PersonSortable2> NameComparator=(o1,o2)-> o1.getName().compareTo(o2.getName());
Comparator<PersonSortable2> AgeComparator=(o1,o2)-> o1.getAge()-o2.getAge();

3. Analyze the following code , answer shapeComparator The object pointed to is related to Comparator What does the interface have to do with ?

Comparator<Shape> shapeComparator = new Comparator<Shape>() {
@Override
public int compare(Shape o1, Shape o2) {
// Your code
}
};

answer : Write with anonymous inner class methods , send shapeComparator Realization Comparator Interface , It can be used Arrays.sort() Methods the sorting .

4.GUI Event handling in

4.1 Write the most important keywords in the event processing model .

answer : Event source — Event object — Event listener

4.2 Use code and comments , Prove that you understand the event handling model .

public class EventObject implements java.io.Serializable {
protected transient Object source;
public EventObject(Object source);
public Object getSource();//getSource Get the event source
public String toString();
} public class MainGUI {
public static void main(String[] args) {
JFrame f = new JFrame("Test");// Create an event template Test
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// Set the user to initiate... On this form "close" Default action when
JButton b = new JButton("Press Me!");// Here's a button event source
b.addActionListener(new ButtonHandler());// Next you need to use the event listener , So register here first f.add(b);
f.setSize(200, 100);
f.setVisible(true);
}
private static class ButtonHandler implements
ActionListener{// Monitor
public void actionPerformed(ActionEvent e) {
System.out.println("Action occurred");
System.out.println(e.getSource());// Get the event source
}
}
}

5. Pair programming : Object oriented design ( Big homework 2- It's very important , Hang in the air -2)

Continue to improve last week's project assignment . The assessment points are as follows :

5.1 Try rewriting... Using the graphical interface .

5.2 Give a screenshot of two people submitting the same project on the code cloud .

5.3 Compared with last week , What are the major changes to the project ?

Reference material :

Pair programming reference

Use Processon drawing

video - Use Netbeans To write GUI

important :Swing Experimental references

JTable usage , Used to render table data

Swing Related articles

3. Code submission records and PTA Summary of the experiment

Topic collection :jmu-Java-04- object-oriented 2- Advanced - Polymorphic interface inner class

3.1. Code cloud code submission record

3.2. PTA experiment

function ( Choose to do :4-1)、 Programming (5-3, 5-4)

There must be a summary of the experiment

  • Use anonymous classes and Lambda Expressions simplify code , It can be written directly in the sort statement .
  • Pay attention to the judgment of empty stack and full stack .
  • Static inner class , Defined in class , In any way , use static Definition . Mainly in methods of external classes , Create inner class objects , Use properties of inner classes , Static inner classes can only access static members of outer classes .

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