core java volume 1

Java Core Technology Volume One Java base type Integral type Data Type Number of bytes range of Values Int 4 +_2^4*8-1 Short 2 +_2^2*8-

Tag: Util indicates date () Date class specifies date standard int ringIn the Java core Technology volume, the first date class appears in a very high frequency, so we have a small integration of the date classThe date class has twoThe date class represents a specific time classThis constructor assigns a Date object and initializes it to represent the specified n

interrupted by Interruptedexcetpion"); Thread.CurrentThread (). interrupt (); //The interrupt state is cleared when the interruptedexception exception is generated, all the interrupts are reset or thrown out for subsequent code to detect if an interrupt has occurred } if(thread.currentthread (). isinterrupted ()) System. out. println ("Sub thread is interrupted"); ElseSystem. out. println ("Sub Natural Stop"); } }; Thread T=NewThrea

Book: "Java Core Technology Vol. two advanced features 9"Time: 2017.9.4-17:131. FlowInput stream: An object from which a sequence of bytes can be read; abstract class (InputStream)Output stream: An object to which a sequence of bytes can be written; abstract class (OutputStream)Source of the stream: file, network connection, memory block.Byte-oriented, so it is inconvenient to process Unicode information (m

comparable2publicint Comparato (Employee Other)3 {4 return Double. Compare (salary, other.salary); 5 }}Note the type conversion of the Object parameterWhy not provide a Comparableto method directly in the employee class? The main reason is that Java is a strongly typed (strongly typed) language. When the method is called, the compiler checks to see if the method exists.1 PackageCc.openhome;2 Importja

-code unit S u+d835 and u+dd6b. (see http://en.wikipedia.org/wiki/UTF-16 for a description of the encoding algorithm.) in Java, the char type describes a code unit in the UTF-16 encoding.Our strong recommendation isn't to use the char type in your programs unless you are actually manipulating UTF-16 cod E units. You is almost always better off treating strings as abstract data types.3.3.4. The Boolean Type The Boolean type has two values, false and Tr

box containing a message and an OK button, which will be in the center of its parent component.API javax.swing. Timer 1.2Timer (int interval, ActionListener Listener)Constructs a timer that advertises listener once every interval millisecond.void Start ()Start the timer. Once the boot is successful, the timer invokes the listener's actionperformed.API void Stop ()Stop the timer, and once the stop is successful, the timer will not be actionperformed to call the listener.Java. Awt. Toolkit 1.0Sta

1. Static constants:Static variables are used relatively little, but static constants are used more, for example, a static constant is defined in the Math class:public static Final PI = 3.141592653;In the program, this constant can be obtained in the form of Math.PI.If the keyword static is omitted, Pi becomes an instance field of the math class and needs to be accessed through an object of the math class, and each math object has its own copy of Pi."

throws interrupterexception{ Sleep (delay);}10.synchronized keywords Public synchronized Voi Method () { method body}Equivalent to Public void method () { this. Intrinsiclock.lock (); Try { method body }finally{ this. Intrinsiclock.unlock ( ); }}11. Use Object Lock public class bank{ public void transfer (int from, int to, int mount) { synchronized -=amount; Accounts[to] +=amount; } System.out.println (...); private double [] Account; p

Over the last one months. Just swallowed the book over. The book is long enough to say 706 pages. I have never been a person who likes to record, have been reading what books have been read to throw aside, may sometimes have so a little want to record down the impulse, but the calculation time is too tight, a lot of youshiwuzhong, after all, research and research program is only a hobby of their own, but did not expect to sign a programmer's work. Alas, this God is too much fun, let a study of e

34 Return 35 instanceof 36 Static 37 Final 38 Super 39 This 40 Native 41 Strictfp 42 Synchronized 43 Volatile

schematic, the inside of the compiler is certainly not outer An implicit reference to an external class is set in the constructor. The compiler modifies all constructors for the inner class, adding a parameter that references the external class. Even if you do not define a constructor for an inner class, the compiler generates a default constructor for the inner class. such as:Publictimeprinter (talkingclock clock) {outer = clock;}When an inner class object is created in the Start method, th

For this code, a lot of netizens are full of questions, first there are many, not careful, did not write the pair class, to compile.Certainly compiled, the pair class is on the first two pages of the other code.And here, the features of generics are written. By several constructors, and the change of parameters, the generic type is explained.Package pair1;public class pairPrivate T first;Private T second;Public Pair () {first = null;second = null;}Public Pair (t first, t second) {This.first = Fi

6.1.2 interface is not a class, cannot instantiate an interface, but can declare the variable of the interface; comparable x; The interface variable must refer to the class object that implements the interface; x = new Employee ();Checks whether an object belongs to a particular class (instanceof);Checks whether an object belongs to a particular interface (instance), if (AnObject instanceof comparable) {...}6.1.3 Interfaces and abstract classesAn abstract class can only extend one class (single

of a larger application and then your start the application withJava ApplicationAnd the main method of the Employee class is never executed.The program in Listing 4.3 contains a simple version of the Employee class with a static field NextID and a static met Hod Getnextid. We fill an array with three employee objects and then print the employee information. Finally, we print the next available identification number, to demonstrate the static method.Note that the Employee class also have a stati

Lambda An expressionform: parameter, arrow (-), expressionParameter type to write, if you can deduce it can not writeOnly one argument can omit parenthesesNo arguments to write empty brackets ()* If the branch returns a value, then all branches will return a value, otherwise it is illegalfunction interface: interface with only one abstract method (can be marked with @functionalinterface annotations)For example, you can do this in Javax.swing.Timer.　　　　　　Timer T = new timer (+, event-{...});The s

Java core-Reflection (1), java core-ReflectionJVM and class:Run java: java class with the main method to start jvm, and load the bytecode --------------------------------------------- w

, the details of the implementation do not affect the hierarchical structure of the subtype polymorphism. The type determines what method the object calls, and the implementation determines how the object executes the method. In other words, the type indicates responsibility, and the implementation is the concrete implementation. After separating the implementation from the type, we seem to see the two parts dancing together, the type determines the name of his partner and dance, and the realiza

java MyProg >log.txt 5) The processor that can change non-default catch exception Thread.setDefaultUncaughtExceptionHandler{ new Thread.UncaughtExceptionHandler(){ public void uncaughtException(Thread t, Throwable e){ //save info to file } } } 6) If you want to see the class loading process, you can invoke the-verbose flag to start the Java