「java点赞狂题」有赞java面试题
今天给各位分享java点赞狂题的知识,其中也会对有赞java面试题进行解释,如果能碰巧解决你现在面临的问题,别忘了关注本站,现在开始吧!
本文目录一览:
java编程题
1.package test;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;
public class Test {
public static void main(String[] args) {
String str = "afdjasdg$$jfsjdfjdjjdjdjdjdjdj";
int max=0;
Object chars=null;
Map tree = new TreeMap();
for (int i = 0; i str.length(); i++) {
char ch = str.charAt(i);
if ((ch = 1 ch = 255) ) {
if (!tree.containsKey(ch)) {
tree.put(ch, new Integer(1));
} else {
Integer in = (Integer) tree.get(ch) + 1;
tree.put(ch, in);
}
}
}
Iterator tit = tree.keySet().iterator();
while (tit.hasNext()) {
Object temp = tit.next();
if(max=Integer.parseInt(tree.get(temp)+""))
{
max=Integer.parseInt(tree.get(temp)+"");
chars=temp;
}
}
System.out.print(chars.toString() + "出现" + max + "次");
}
}
只要用assic码做范围就可以了.任何字符都可以过滤.
2.方法很多,hashmap或是arraylist,数组都可以的.就是对应关系而已.
package test;
public class ListTest {
static String[] to_19 = { "zero", "one", "two", "three", "four", "five",
"six", "seven", "eight", "nine", "ten", "eleven", "twelve",
"thirteen", "fourteen", "fifteen", "sixteen", "seventeen",
"eighteen", "nineteen" };
static String[] tens = { "twenty", "thirty", "forty", "fifty", "sixty",
"seventy", "eighty", "ninety" };
static String[] denom = { "", "thousand ", "million", "billion",
"trillion", "quadrillion", "quintillion", "sextillion",
"septillion", "octillion", "nonillion", "decillion", "undecillion",
"duodecillion", "tredecillion", "quattuordecillion",
"sexdecillion", "septendecillion", "octodecillion",
"novemdecillion", "vigintillion" };
public static void main(String[] argv) throws Exception {
long tstValue = 12345;
ListTest itoe = new ListTest();
System.out.println(itoe.english_number(tstValue));
}
private String convert_nn(int val) {
if (val 20) return to_19[val];
int flag = val / 10 - 2; if (val % 10 != 0)
return tens[flag] + "-" + to_19[val % 10];
else return tens[flag];
}
private String convert_nnn(int val) {
String word = "";
int rem = val / 100;
int mod = val % 100;
if (rem 0) {word = to_19[rem] + " hundred ";}
if (mod 0) {word = word + convert_nn(mod);}
return word;
}
public String english_number(long val) {
if (val 100) {System.out.println((int) val);return convert_nn((int) val);}
if (val 1000) {return convert_nnn((int) val); }
for (int v = 0; v denom.length; v++) {
int didx = v - 1;
long dval = new Double(Math.pow(1000, v)).longValue();
if (dval val) {
long mod = new Double(Math.pow(1000, didx)).longValue();
int l = (int) (val / mod);
long r = (long) (val - (l * mod));
String ret = convert_nnn(l) + " " + denom[didx];
if (r 0) {ret = ret + ", " + english_number(r);}
return ret;
}
}
return null;
}
}
JAVA实现点赞功能 if语句
Goods表设计的有问题啊
goods(赞数)应该在新闻表里
goods表只要存id
news_id(新闻id)
user_id(用户id)
发sql查是否已点赞的时候where条件判断news_id
和
user_id
select
count(1)
from
Goods
where
news_id=?
and
user_id=?
值大于0就代表已点赞
只等于0就插入点赞的数据
5道简单的JAVA编程题(高分悬赏)
很详细的帮你写下,呵呵,所以要给分哦!
1、
(1)源程序如下:
public class One {
public static void main(String[] args) {
String name = "张三";
int age = 23;
char sex = '男';
String myclass = "某某专业2班";
System.out.println("姓名:" + name);
System.out.println("姓名:" + age);
System.out.println("姓名:" + sex);
System.out.println("姓名:" + myclass);
}
}
(2)
编写完程序的后缀名是.java,如本题,文件名就是One.java。
开始\运行\cmd,进入“命令提示符窗口”,然后用javac编译器编译.java文件,语句:javac One.java。
(3)
编译成功后,生成的文件名后缀是.class,叫做字节码文件。再用java解释器来运行改程序,语句:java One
2、编写程序,输出1到100间的所有偶数
(1)for语句
public class Two1 {
public static void main(String[] args) {
for(int i=2;i=100;i+=2)
System.out.println(i);
}
}
(2)while语句
public class Two2 {
public static void main(String[] args) {
int i = 2;
while (i = 100) {
System.out.println(i);
i += 2;
}
}
}
(3)do…while语句
public class Two3 {
public static void main(String[] args) {
int i = 2;
do {
System.out.println(i);
i += 2;
}while(i=100);
}
}
3、编写程序,从10个数当中找出最大值。
(1)for循环
import java.util.*;
public class Three1 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int number;
int max = 0;
for (int i = 0; i 10; i++) {
System.out.print("输入第" + (i + 1) + "个数:");
number = input.nextInt();
if (max number)
max = number;
}
System.out.println("最大值:" + max);
}
}
(2)while语句
import java.util.*;
public class Three2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int number;
int max = 0;
int i = 0;
while (i 10) {
System.out.print("输入第" + (i + 1) + "个数:");
number = input.nextInt();
if (max number)
max = number;
i++;
}
System.out.println("最大值:" + max);
}
}
(3)do…while语句
import java.util.*;
public class Three3 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int number;
int max = 0;
int i = 0;
do {
System.out.print("输入第" + (i + 1) + "个数:");
number = input.nextInt();
if (max number)
max = number;
i++;
}while(i10);
System.out.println("最大值:" + max);
}
}
4、编写程序,计算从1到100之间的奇数之和。
(1)for循环
public class Four1 {
public static void main(String[] args) {
int sum=0;
for(int i = 1;i=100;i+=2){
sum+=i;
}
System.out.println("1~100间奇数和:" + sum);
}
}
(2)while语句
public class Four2 {
public static void main(String[] args) {
int sum = 0;
int i = 1;
while (i = 100) {
sum += i;
i += 2;
}
System.out.println("1~100间奇数和:" + sum);
}
}
(3)do…while语句
public class Four3 {
public static void main(String[] args) {
int sum = 0;
int i = 1;
do {
sum += i;
i += 2;
} while (i = 100);
System.out.println("1~100间奇数和:" + sum);
}
}
5、
(1)什么是类的继承?什么是父类?什么是子类?举例说明。
继承:是面向对象软件技术当中的一个概念。如果一个类A继承自另一个类B,就把这个A称为"B的子类",而把B称为"A的父类"。继承可以使得子类具有父类的各种属性和方法,而不需要再次编写相同的代码。在令子类继承父类的同时,可以重新定义某些属性,并重写某些方法,即覆盖父类的原有属性和方法,使其获得与父类不同的功能。另外,为子类追加新的属性和方法也是常见的做法。继承需要关键字extends。举例:
class A{}
class B extends A{}
//成员我就不写了,本例中,A是父类,B是子类。
(2)编写一个继承的程序。
class Person {
public String name;
public int age;
public char sex;
public Person(String n, int a, char s) {
name = n;
age = a;
sex = s;
}
public void output1() {
System.out.println("姓名:" + name + "\n年龄:" + age + "\n性别:" + sex);
}
}
class StudentPerson extends Person {
String school, department, subject, myclass;
public StudentPerson(String sc, String d, String su, String m, String n,
int a, char s) {
super(n, a, s);
school = sc;
department = d;
subject = su;
myclass = m;
}
public void output2() {
super.output1();
System.out.println("学校:" + school + "\n系别:" + department + "\n专业:"
+ subject + "\n班级:" + myclass);
}
}
public class Five2 {
public static void main(String[] args) {
StudentPerson StudentPersonDemo = new StudentPerson("某某大学", "某某系别",
" 某专业", "某某班级", " 张三", 23, '男');
StudentPersonDemo.output2();
}
}
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发布于:2022-11-29,除非注明,否则均为
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