common java interview questions

The six most common Java computing questions are: 1. 3 white balls 3 Red Balls 6 black balls random 8 balls, calculate all results Public class Ball {public static void main (String [] args) {int a = 3, B = 3, c = 6, I = 0; for (int x = 0; x 2. Digital pyramid public class Pyramid { public static void main(String args[]){ for (int i=1; i 3. Check whether the d

]); sb.reverse (); sb2.append (sb) ;if(i = = ss.length-1) {sb2.append (".");}Else{sb2.append (" ");}} System. out. println (sb2);}6.String s= "name=zhangsan age=18 classno=090728";The above string is split and the result is as Follows:Zhangsan 18 090728 public Static voidmain (string[] Args) {String s="Name=zhangsan age=18 classno=090728"; string[] SS= S.split (" "); StringBuffer SB=NewStringBuffer (); for(inti =0; I ) {string[] SS2=ss[i].split ("="); Sb.append (ss2[1]); Sb.append (" "); } Sys

Interview preparation series 03 ---- Summary of Binary Tree questions in the interview Interview preparation series 03 ---- Summary of Binary Tree questions in the interview This article is the first article in the

1. Output order of static code block, non-static code block, constructor functionCase one: When the parent class is not inherited1 classHelloa {2 3 PublicHelloa () {4System.out.println ("I ' M A class");5 }6 7 Static {8System.out.println ("Static A");9 }Ten One { ASystem.out.println ("A"); - } - the Public Static voidMain (string[] args) { - NewHelloa (); - NewHelloa (); - } +}Output Result:Static AAI ' M A classAI ' M A classAnalysis:

packagecom.xiaowu.demo;/*** Two table tennis team to play, each out three People. Team A for A,b,c three, team B for the x, y, z three, with lots to decide the contest List. Someone asked the team about the game List: A said he did not compare with x, C said he did not and x, * Z ratio. Please compile the procedure to find out the list of the three Teams. * * @authorWQ **/ public classDemo18 { public Static voidmain (string[] Args) {vs (); } public Static voidvs () {Char[] m = {' a ', ' b '

1. The difference between sleep () and wait ():Both can control the linear process and block the Process. The difference is:-----|sleep (): frees the CPU and does not release resources (locks). You can make it automatically wake up by specifying a time, but only by calling Iterreput () to force the interrupt;-----|wait (): frees the CPU and frees up resources (locks). Must be used in the context of a lock, that is, synchronous code block, synchronous method, when used: lock. wait ();

PackageCom.xiaowu.demo;/*** * Print out the case (diamond) * * * *@authorWQ **/ Public classDemo20 { Public Static voidMain (string[] args) {display (5); } Public Static voidDisplayinth) { for(inti = 0; I ) { for(intj = 0; J ) {System.out.print (" "); } for(intK = 1; K ) {System.out.print ("*"); } System.out.println (); } for(inti = 1; I ) { for(intj = 1; J ) {System.out.print (" "); } for(intj = 0; J ) {System.out.print ("*");

PackageCom.xiaowu.demo;//a 5-digit number, judging whether it is a palindrome number. That is, 12321 is a palindrome number, single-digit and million-bit the same, 10 bits and thousands of the same. Public classDemo24 { Public Static voidMain (string[] args) {F2 (123454321); } //Method One Public Static voidF1 (intN) {if(n >= 10000 N ) {String s=string.valueof (n); Char[] C =S.tochararray (); if(C[0] = = C[4] c[1] = = C[3]) {System.out.println (n+ "is a palindrome number. "); } Else{Sy

PackageCom.xiaowu.demo;//Monkey Eat Peach problem: The first day of monkeys to take off a number of peaches, immediately ate half, still not enjoyable, and eat one more;//The next morning he ate half of the remaining peaches and ate one more. //every morning after eating the rest of the day half of the zero one. By the 10th morning when I wanted to eat again, there was only one peach left. Ask how many peaches were picked on the first day. Public classDemo16 { Public Static voidMain (string[] a

PackageCom.xiaowu.demo;/*** * There is a fractional sequence: 2/1,3/2,5/3,8/5,13/8,21/13 ... find the sum of the first 20 items of this series. * * * @authorWQ **/ Public classDemo19 { Public Static voidMain (string[] args) {sum (20); } Public Static voidSumintN) {Doublex = 2.0; Doubley = 1.0; DoubleT; Doublesum = 0; for(inti = 1; I ) {sum+ = (X/y); T=y; Y=x; X= y +T; } System.out.println (The "before" + N + "items are the same as:" +sum); }}Java