java programming exercises book

Java programming ideas personal exercises I hope you will be grateful for your criticism ......)Chapter 3 exercise 9 (1) show the maximum and minimum numbers represented by float and double indexes respectively public class MaxMinFloatDouble { /** * @param args */ public static void main(String[] args) { // TODO Auto-gen

reference type, when he is directly assigned to the value of the corresponding reference position is assigned to the string variable, so, two times the result is true. If you assign a value with the new String (), the result will be different. Write a program that simulates the result of tossing a coinPackage Net.mindview.operators;import Java.util.random;importStaticnet.mindview.util.print.*; Public classThrowcron { Public Static voidMain (string[] args) {Random num=NewRandom (); intA = Num.

Third questionPackage net.mindview.interfaces;Abstract classbase{ PublicBase () {print (); } Abstract voidprint ();} Public classTest3 extends base{Private inti =5; @Overridevoidprint () {System. out. println (i); } Public Static voidMain (string[] args) {Test3 T=NewTest3 (); T.print (); }}Output Result:0 5When calling the base class construction method, it simply allocates a chunk of memory space to the member variable of the subclass and sets the value of the memory space to the defa

JVM instance has only one heap space, and all threads share the heap;Stack: Each time a new thread JVM is started, it is assigned a Java stack, and the Java stack saves the thread's running state in frames;Stack frame: consists of local variable area, operand stack and frame data area;Local method Stack: Java programs often call local methods, local methods can

"." Location of the number - intindex = Name.lastindexof ('. ')); Wu //get the suffix of a file -String prefix =name.substring (index); About $ //The judgment must contain the "." Number, and cannot appear in the first place, with the suffix named "java" - if(Index! =-1 Index! = 0 prefix.equals (". Java")) { - - return1; A

table is not used at all. Compile with Javac, and then run it in Java. If you're using a different development environment than the JDK, learn how to compile and run it in your environment Public class javathinking { publicstaticvoid main (string[] args) { System.out.println ("Hello,world");} }Exercise 3: Find the code snippet that contains the atypename, rewrite it as a complete program, and then compile, runclass atypename{ pub

, 50); B3.setbounds (670, +, +), This.add (B1); This.add (B2); This.add (b3); This.add (JL1); This.add (JL2); This.add (JL3);} /** * Rewrite: Paint method */@Overridepublic void Paint (Graphics g) {super.paint (g); if (P1! = null P2! = null) {P1.draw (g , P1.getpoint ()-1, 2.draw (g, P2.getpoint ()-1, 425, 100);p;}}The window is a bit big ... Too lazy to adjust ...3.Package com.lovo.homework;/** * Class: Actuator? * @author Abe */public class Crapstest {public static void main (string[] args) {

("**************************"); System.out.println ("Please enter the action you have chosen:"); } Public Static voidMain (string[] args) {Carmanager cm=NewCarmanager (); Cartest CT=Newcartest (); Ct.menu (); Scanner SC=NewScanner (system.in); while(true) { intn =Sc.nextint (); Switch(n) { Case1: Cm.add (); Ct.menu (); Continue; Case2: Cm.show (); Ct.menu (); Continue; Case3: Cm.changbrand (); Ct.menu (); Continue; Case4: Cm

"; Splitting.split (regex); }}Question NinethPackage Net.mindview.strings.test9;import net.mindview.strings.Splitting;PublicClassTest9 {PublicStaticvoidMain (string[] args) {String regex ="a| e| i| o| U|a|e|i|o|u";//A case-insensitive match can also be enabled through an inline flag expression (? i). String regex1 ="(? i) a|e|i|o|u";//[ABC "denotes a or B or c String regex2 = " (? i) [Aeiou]" ; System. out.println (Splitting.knights.replaceAll (regex, " Span style= "COLOR: #800000" >_ "out.pri

floatMinfen = Fens[0]; intMinindex = 0; for(inti = 1; i ) { //Modify the minimum score if(Minfen Fens[i]) {Minfen=Fens[i]; Minindex=i; } } returnMinindex; } Public intGethightfenindex () {//Selection method: Think the first one is the lowest score floatMaxfen = Fens[0]; intMaxindex = 0; for(inti = 1; i ) { //Modify the minimum score if(Maxfen Fens[i]) {Maxfen=Fens[i]; Maxindex=i; } } returnMaxindex; }}In

of the concept is still need to slowly scrutinize and contact to understand the principle! Generally speaking feel can accept, the teacher said the book content can understand understand, class homework These can also be completed independently, although do when still a little rusty but fortunately can find a way to solve in time. In the future study must keep in mind the teacher's teaching more thinking more practice, independent completion of homew

Environment: Notpad + + 6.0 + JDK 6.0.31Issue: Use sockets to write client-server programs that enable client-server interaction calculations. The customer sends the length of the triangle 3 sides to the server, and the server returns the area of the computed triangle to the customer.WORKAROUND: Use Java socket programming. The client sends the data, and the server receives the data and handles it according

(String name) {THIS.name =Name }voidSetempty () {isfull =False; }voidSetfull () {isfull =True; } @OverrideProtectedvoidFinalize () {if (!Isfull) {System.OUT.PRINTLN (name +": Clean"); }//Super.finalize ();}}ClassMain {PublicStaticvoid main (string[] args) {Tank T1 = new Tank (" t1); Tank t2 = new Tank ( "t2 "); Tank t3 = new Tank ( "t3 "); T1.setfull (); T2.setempty (); T1 = nullnull; T3 = null; System.GC (); }} /** * output:t3: Cleanup T2: Clean *///:~ /span>

acquisitionRTTI (to be known at compile time)Reflection (Dynamic)In-depth study of the container of generics (many words) (many words)Java I/O system (I feel this should be no use now, this is the Java virtual machine directly write data to the hard disk)File InputStream and OutputStreamAnnotations (for compilers, similar to C language volunteer, but mostly logs?) This is a little strange.)@Override, @Depr

valueSecond, complete the main methodTips: 1, call the custom method, save the method return value in the variable maxscore 2, output variable result1 Public classHelloWorld {2 3 //complete the Main method4 Public Static voidMain (string[] args) {5 6 //Create object, object named Hello7HelloWorld Hello =NewHelloWorld ();8 9 //calling a method and saving the return value in a variableTen intMaxscore =hello.getmaxage (); One A

;//boolean b2=s1Fourth. Exercise 1: (1) write a program that prints values from 1 to 100public static void Main (string[] args) {test (100);} public static void Test (int num) {int i=0;while (iExercise 2: (2) write a program that generates 25 random numbers of type int, and for each random number, use the If-else statement to classify it as greater than, less than, or equal to a randomly generated value immediately following it.public static void Main (string[] args) {test ();} public static voi

The book is generally finished, but the seventh chapter is not in a hurry to end.But fortunately it is finished, barely count it.Recall this year, quite feeling, the heart has been seeking progress, but it is very difficult to act up.Think about it indeed ah, want to always progress must sacrifice their spare time, although not to exclude learning, but you have to admit that the feeling of paralysis is very good.Man, there's really nothing to stop, an

still need to read first, in reverse summarize the following, the effect will be very good, the first chapter has a lot of not written up, such as Java object Heap mechanism, look at Java before the best C, C + + Some understanding, Java did optimize a lot of features, but I am not a particular language of the death of loyalty, arguing this also meaningless , bu

Learning programming language at school is just plain understanding, there are a lot of things that do not understand, want to pass this book to the Java language has a deeper understanding, for future study and work will have great benefits. Rather than a cursory look at some of your books, know it but do not know why, this is not what I want to learn.The readin

The 2nd Chapter: everything is the object If a member of a class is a basic data type, Java ensures that it obtains a default value even if it is not initialized. For a "local" variable (that is, a field that is not a category), a value must be given before use, and if you forget to do so, Java will return an error at compile time to tell you that the variable is not initialized. A is an object, and