java interview programs

Java interview question summary and java question Summary1) What design patterns have you used? One by hand (except for a singleton); the factory mode, the facade mode (like the service layer); the proxy Mode 2) What is the core of springmvc, how is the request process handled and how is the reversal implemented? 1. The user sends the request to the front-end con

Java custom generic interview questions: receive any array to reverse, java custom You can only operate on a certain type for reversal without using the generic type. The Code is as follows: package com.swift.fanxing;import org.junit.Test;public class RenyiReverse { @Test public void test() { int arr[]=new int[] {1,10,6,9,2}; reverse(arr);

1Classdemo01{2PublicStaticvoidMain (string[] args) {3//Assignment operator =45//Example 16int a = 1;7System.out.println (a);8//Results 191011//Example 212int a = 1;System.out.println (a=2);14//Results 215//First assignment, then output161718//Example 319int a = 1;20int B = A + (a=2) + A + (a=3);21st//= 1 + (a=2) + A + (a=3)22//= 1 + 2 + A + (a=3)23//= 1 + 2 + 2 + (a=3)24//= 1 + 2 + 2 + 325//= 826System.out.println (a);27System.out.println (b);28//Result 3,8293031//Example 432int a = 1;33int B =

not define its own Equals method, it inherits the Equals method of the object class, and the implementation code for the Equals method of the object class is as follows:Boolean equals (Obejct o) {This==o;}This means that if a class does not define its own Equals method, its default Equals method (inherited from the object class) is using the = = operator, and whether the object pointed to by the two variables is the same object, using equals and using = = will get the same result. If the compar

Java interview questions, java questions 1. storage structures used by stacks and queues Chain storage and sequential Storage 2. understanding of time complexity and space complexityTime Complexity: Number of statement executions in an algorithm, which is T (n). When n changes, it is O (f (n). For example, constant O (1 ), O (n2), O (nlog2n)Space complexity: t

() = = Integer.class) { System.out.println ("Integer i is a integer"); } if (Integer.class.isInstance (i)) { System.out.println ("Integer i is a integer"); }The name can also be output directly from the GetClass () method's GetName ().3, about random number generation of class randompublic int Nextint (int n)The function of this method is to generate a random int value that is in the interval of [0,n], which is a random int value between 0 and N, containing 0 without n.4

) J--;//find the number that is lower on the right than the middle value if(I //Replace the large number on the left and the small number on the rightTempdate =Strdate[i]; Strdate[i]=Strdate[j]; STRDATE[J]=tempdate; I++; J--; } } while(i //stop when the two are staggered if(I Right ) {QuickSort (strdate, I, right);//from } if(J >Left ) {QuickSort (Strdate, left, J); } }}Java algorithm

, byte stream and character stream, stream concept, reader, stream etc; NIO (channel, buffer, selector) Common multithreaded interview points for Java: Thread, start (), run () Multiple threads inside the keyword, wait, notfiy, lock (synchronized), lock interface Thread state, context switch, daemon thread Several ways of realizing consumers and producers, advantages and disadvanta

Synchronous In multithreaded programs, synchronization modifiers are used to control access to critical section code. One way is to use the Synchronized keyword to ensure thread safety for your code. In Java, synchronized-modified code blocks or methods are not accessed concurrently by multiple threads. It forces the thread to obtain a lock before entering a method, releasing the lock when it leaves

For Java beginners, it is recommended to use a plain text file to write Java programs, and use the tool program to compile and execute Java programs in command-mode. Compile. Java using the Javac tool and Execute. class using

For Java beginners, it is recommended to use a plain text file to write Java programs, and use the tool program to compile and execute Java programs in command-mode. Compile. Java using the Javac tool and Execute. class using

more flexible because they do not have any implementation code. After a class implements an interface, this class implements all the methods and attributes in the interface, and the attributes in the interface are under the default state are public static, and all methods are public by default. A class can implement multiple interfaces. 3. Advantages and principles of garbage collection. Two recovery mechanisms are also considered. A notable feature of Java