drawing methods of graphics class in java

1. About subclass methods overriding the parent class method follows the rule of "two and two small and one big"Two identical: (1) method name (2) formal parameter listTwo small: (1) Subclass the return value type is smaller than the parent class or equal (2) the exception thrown by the subclass declaration should be smaller or equal than the parent classOne larg

The methods used in the 1.Object class are: Protected Object Clone () creates and returns a copy of this object. Boolean equals (Object obj) indicates whether another object is "equal" to this object. protected void Finalize () This method is called by the object's garbage collector when the garbage collector determines that there are no more references to the object.

Class Reflectiondemo Copy Code code as follows: Package Reflection; @Deprecatedpublic class Reflectiondemo {Private String Pri_field;Public String Pub_field;Public Reflectiondemo () {}Public Reflectiondemo (String name) {}Private Reflectiondemo (String name,int int1) {}public void ReflectMethod () {}public void ReflectMethod (String str) {}private void ReflectMethod (int int1) {}

Accessing methods through array elements only accesses methods defined in animal,The methods defined in tiger and fish cannot be called, such as Statement Animal[2].swim (); WhenA type conversion is required to access these methods, as shown in the following procedure.1 Public classdynamicmethoddemo2{2 Public Static

To facilitate interaction between webpages and Android applications, the Android system provides a mechanism for JavaScript webpage scripts in WebView to call Java methods. You only need to call the addJavascriptInterface method to map a Java object to a JavaScript Object.1. Map a Java object to a JavaScript Object0102

target object!Waiter Waiterproxy = (waiter) proxy.newproxyinstance (loader, interfaces, h); Gets the Manwaiter enhanced objectWaiterproxy.serve (); Execute the Invoke method in Waiterinvocationhandler here}}Define a class implementation Invocationhandler this is the enhanced classpublic class Waiterinvocationhandler implements Invocationhandler {Private Waiter waiter;//target objectPublic Waiterinvocationh

class base{???? intx = 1; ???? staticinty = 2; ???? String name () {???????? return"mother"; ????}???? static String Staticname () {???????? return"static mother"; ????}}class Subclass extends base{ ???? intx = 4; ???? inty = 5; ???? String name () {???????? return"Baby"; ????}???? static String Staticname () {???????? return"static Baby"; ????}} Public

Two Methods of the Arrays class in Java: deepEquals and equals DeepEquals and equals are two static methods of the Arrays class in Java, but what are the differences between them? Code 1, import java.util.Arrays;public

Deepequals and equals are the two static methods of the arrays class in Java, but what is the difference between them?Code One,Import Java.util.arrays;public class Test {public static void main (string[] args) {string[][] name1 = {{"G", "a", "O"},{" H "," U "," a "," N "},{" J "," I "," E "}; String[][] Name2 = {{"G",

Charat () to get the character at the specified position.String Str= "This is a String";Char Chr=str.charat (3); Chr= "I"B, Method GetChars () to get a part of the string stringpublic void GetChars (int srcbegin,int srcend,char[]dst,int dstbegin)String Str= "This is a String";Char chr =new char[10];Str.getchars (5,12,chr,0);nbsp; Chr= "is a St"C, SubString () is another way to extract a string that specifies where to begin extracting the string and where to end it.3. Manipulating stringsThe A,

Common date methods for Java projects classPackage Com.school.util;import Java.text.parseexception;import Java.text.simpledateformat;import Java.util.arraylist;import Java.util.calendar;import Java.util.date;import java.util.list;/** * Provides some common methods related to dates. * @author Nimade */public abstract class