how to print in printer

Because everything in Java is an object, many activities become simpler, and this is one example. The code for each object in Java exists in a separate file. The file is not loaded unless you really need the code. In general, we can assume that unless an object of that class is constructed, the code is not actually loaded. When loaded, all the static and static blocks are initialized in their original order (i.e., the order in which they are written in the class definition code). Of course

(such as ++a or--a), the operation is performed first, and then the value is generated. And for after-increment and decrement (such as a++ or a--), Mr will be a value, and then perform the operation. Here is an example: : Autoinc.java //demonstrates the + + and--operators public class Autoinc {public static void main (String [] args { int i = 1; PRT ("I:" + i); PRT ("++i:" + ++i); Pr

the overwritten method of the parent class. The output shows this:Demosuper:Name = Kevin age = 22This method is commonly used. In addition, if the members of the parent class can access the quilt class, you can use it like this and use "super. in the parent class, but you often do not access the Member names in the parent class in this way.In the constructorConstructor is a special method that is automatically called during object initialization. In the constructor, this and super also have var

Integer (47);Integer n2 = new Integer (47);SYSTEM.OUT.PRINTLN (n1 = = N2);SYSTEM.OUT.PRINTLN (n1! = n2);System.out.println (N1.equals (N2));}Results:FalseTrueTrue5. The left shift operator (If you shift the char, byte, or short, they are automatically converted to an int before the shift is made.6. String operator +7, pay attention to the automatic type conversion in arithmetic operation. Use mandatory types to ensure accurate results.8, (1) A simple continue will return the beginning of the mo

/3, which is its source code: 1 port_command(Port, Data, Flags) ->2 case case erts_internal:port_command(Port, Data, Flags) of3 Ref when erlang:is_reference(Ref) -> receive {Ref, Res} -> Res end;4 Res -> Res5 end of6 Bool when Bool == true; Bool == false -> Bool;7 Error -> erlang:error(Error, [Port, Data, Flags])8 end. It is not hard to see that there is also a synchronous call here, that is, when the result returned after fun erts_internal: port_command/3

After creating a factory, use it to create a rendering target. // Obtain the size of the drawn area. rect RC; getclientrect (hwnd, rc); // create direct2d rendering target id2d1hwndrendertarget * PRT = NULL; hresult hR = pd2dfactory-> createhwndrendertarget (d2d1: rendertargetproperties (), d2d1:: hwndrendertargetproperties (hwnd, d2d1: sizeu (RC. right-RC. left, RC. bottom-RC. top), PRT );The rendering

parent class. Also note that Super.name calls the value of the member variable, class country {string name= "Xianfan"; string value (String name) {name = "China", return Name;}}class City extends country {string name; string value (String name) {name = "Hefei"; super.value ("failed");//When this method is not called, Super.name returns the value of the member variable of the parent class NULLNBSP;SYSTEM.OUT.PRINTLN (name); system.out.println (super.name); return Name;}public static void Main (

() and only call the parent class variable name, the parent class name value is the default value NULL.3. Reference constructorsSuper (parameter): Invokes one of the constructors in the parent class (which should be the first statement in the constructor). This (parameter): Call the constructor of another form in this class (should be the first statement in the constructor).Package Com.demo.test;public class Person {public static void prt (String

Main (string[] args) { demosuper ds=new demosuper (); Ds.setname ("Kevin"); Ds.setage (); Ds.print (); } In Demosuper, the redefined print method repeats the Print method of the parent class, which first does its own thing, and then invokes the overridden method of the parent class. The output illustrates this point: Demosuper: Name=kevin age=22 The use of this method is more commonly used. In addition, if a member of the parent class can access the quilt class, you can use

. The output illustrates this point: Demosuper: Name=kevin age=22 The use of this method is more commonly used. In addition, if a member of the parent class can access the quilt class, you can use it like this, using "super." The name of the member in the parent class, but often you do not access the names of the members of the parent class in this way. Constructors in constructors are a special method that is invoked automatically when an object is initialized. In the constructor, this and sup

. The output illustrates this point: Demosuper: Name=kevin age=22 The use of this method is more commonly used. In addition, if a member of the parent class can access the quilt class, you can use it like this, using "super." The name of the member in the parent class, but often you do not access the names of the members of the parent class in this way. Constructors in constructors are a special method that is invoked automatically when an object is initialized. In the constructor, this and sup

it has a special place, see the following example:class person{Public static void prt (String s) {System.out.println (s);}Person () {prt ("A person.");}Person (String name) {prt ("A person name is:" +name);}}Public class Chinese extends person{Chinese () {super ();//Call Parent class constructor (1)prt ("A Chinese.");

constructorClass person{public static void Prt (String s) {System.out.println (s);}Person () {PRT (A person.);}Person (String name) {PRT (A person name Is+name);}}Public class Chinese extends person{Chinese () {Super (); Calling the parent class constructor (1)PRT (A Chinese.); (4)}Chinese (String name) {Super (name);

): Invokes one of the constructors in the parent class (which should be the first statement in the constructor). This (parameter): Call the constructor of another form in this class (should be the first statement in the constructor).Class Person {public static void prt (String s) { System.out.println (s); } Person () { PRT ("parent class • Parameterless constructor method:"

parent class are called. If you do not call the parent class method value () and only call the parent class variable name, the parent class name value is the default value NULL.3. Reference constructorsSuper (parameter): Invokes one of the constructors in the parent class (which should be the first statement in the constructor). This (parameter): Call the constructor of another form in this class (should be the first statement in the constructor).Class Person {public static void

constructor).A few key points to keep in mind are that this and super cannot coexist in the construction method, and that the next occurrence of this or super must be the 1th sentence of the construction method; The static method, which is the class method, cannot have this and the Super keyword, and the only thing that can coexist is in the instance method. Because this or super statement is not required to be the 1th sentence. Look at this very classic example (because it is very instructive

You can see the code extracted from thinking in Java to understand, even. Sub-arrays of multidimensional arrays do not need to wait long: Multidimarray.javaCreating multidimensional arrays.Import java.util.*;public class Multidimarray {static random Rand = new Random ();static int prand (int mod) {Return Math.Abs (Rand.nextint ())% mod + 1;}public static void Main (string[] args) {int[][] A1 = {{1, 2, 3,},{4, 5, 6,},};for (int i = 0; i for (int j = 0; J PRT