java programming language pdf

1. Can a button trigger the windowevent? Can a button trigger MouseEvent? Can a button trigger ActionEvent?JButton can produce mouseevent and ActionEvent. Cannot trigger WindowEvent2. Can a single source have multiple listeners? Can a listener have multiple sources? Can a listener make its own listener?YES. YES. YES3. Can internal classes be used in other classes that are not nested in him?Objects of an inner class is often created in the outer class. But the can also create an object of a inner

Use of Setactioncommand () and Getactioncommand ()/** * Function: event handling mechanism * */package Com.test3;import java.awt.borderlayout;import java.awt.color;import java.awt.Graphics; Import Java.awt.event.actionevent;import Java.awt.event.actionlistener;import Javax.swing.jbutton;import Javax.swing.jframe;import Javax.swing.JPanel; @SuppressWarnings ("Serial") public class Demo9_3 extends Jframe{mypanel P1 = new Mypanel (); JButton button1 = new JButton ("Black"); JButton button2 = new JB

) {super.paintcomponent (g); G.drawoval (GetWidth ()/2-radius, getheight ()/2-r adius,2 * radius, 2 * radius);}} Class Enlargelistener implements ActionListener {//First step: Create Enlargelistener Class Implementation ActionListener interface// Fifth step: In order for actionperformed to access the Enlarge method, define the class as Inner class@overridepublic void actionperformed (ActionEvent e) {// Fourth step: Overwrite the Actionperformed method in the interface once the operation is monit

Java.awt.flowlayout;import Java.awt.event.actionevent;import Java.awt.event.actionlistener;import javax.swing.jbutton;import javax.swing.JFrame; @SuppressWarnings ("Serial") public class Anonymouslistenerdemo extends jframe{private JButton stringnew = new JButton ("new");p rivate JButton Stringop En = new JButton ("open");p rivate JButton stringsave = new JButton ("Save");p rivate JButton stringPrint = new JButton ("Print ");p ublic Anonymouslistenerdemo () {setlayout (New FlowLayout ()); Add (

Click the text mouse drag the text will be dragged with the mousePackage Chapter16;import Java.awt.borderlayout;import Java.awt.graphics;import java.awt.event.mouseevent;import Java.awt.event.mousemotionlistener;import javax.swing.jframe;import Javax.swing.JPanel; @SuppressWarnings ("Serial ") public class Movemessagedemo extends Jframe{public Movemessagedemo () {Moveablemessagepanel p = new Moveablemessagepanel (); SetLayout (new BorderLayout ()); Add (P);} public static void Main (string[]

*/public void setnumberofyears (int numberofyears) {this.numberofyears = Numberofyears ; }/** return Loanamount */public double Getloanamount () {return loanamount; }/** Set a newloanamount */public void Setloanamount (double loanamount) {this.loanamount = Loanamount; }/** Find Monthly payment */public double getmonthlypayment () {Double monthlyinterestrate = ANNUALINTERESTRATE/1 200; Double monthlypayment = Loanamount * Monthlyinterestrate/(1-(Math.pow (1/(1 + monthlyinterestrate), numbe

size of the chessboard, followed by a number of NXN 0 or 1.Output format:One of three outputs: X O NIL are all uppercase Letters.Input sample: 4 1 0 0 1 0 1 0 0 0 0 1 0 1 0 0 1 Sample Output: X Time limit: 500ms Memory limit: 32000kbImport java.util.Scanner; public class Hello{public static void main (string[] Args) {//TODO auto-generated method Stubscanner in=new Scanner (System . in); int N=in.nextint (); Th

Training Background: Java programming language for non-programmers Junior Java programming language SL-110 Time: 5 days teaching: 50% computers: 50% price: RMB6, 300 Course description: This course provides a great choice

In this chapter, we will briefly talk about the process of object abstraction.1. All languages provide an abstraction mechanism.For example: A=1 (The following are examples, the contents mentioned in it may be wrong, because the author did not learn the machine code and assembly)In machine code: 1000100111011000In the assembly: MOV a,1In the C language: a=1In Java:Class Test () { a=1;}It can be found from the different representations above that the

), was born.1995, Masic. Java birthday-May 23, 1995.1996 Java launched the JDK1.0 version.In July 2004, Sun launched the java5.0 version.In 2009, Oracle acquired Sun for $7 billion.July 2011, JavaSE7 released.March 2014, JavaSE8 released.1.4 Java into 3 versionsJava EE, Enterprise Edition (formerly simplified EE)Javase, Java