「java超难题」java比较难得问题
本篇文章给大家谈谈java超难题，以及java比较难得问题对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。
本文目录一览：
- 1、java超难题,高手帮我看一下下哪里有错误,重谢!
- 2、java难题，欢迎各位能够帮一下忙，谢谢各位帮忙
- 3、Java 三道难题，希望大神详细解答。拜托拜托
- 4、java难题，请求各位高手帮助我解答一下，大家有难题互帮互助？
java超难题,高手帮我看一下下哪里有错误,重谢!
你的程序没有错误，只是没有实现反转写入。
//package com.color.io;
/*
* Main.java
*
* Created on 2000年9月29日, 下午5:17
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
/**
*
* @author admin
*/
public class Main {
/** Creates a new instance of Main */
public Main() {
}
/**
* @param args
* the command line arguments
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// TODO code application logic here
//按文件大小来产生构建buffer
char[] buffer = new char[(int)new File("D:\\新建 文本文档.txt").length()];
Reader reader = null;
try {
reader = new FileReader("D:\\新建 文本文档.txt");
int offset;
while ((offset = reader.read(buffer)) 0)
System.out.print(new String(buffer, 0, offset));
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null)
try {
reader.close();
} catch (IOException e) {
}
}
//将整个文件读入,然后构造成一个String
String s = new String(buffer);
//将这个String按换行符拆分成String数组
String [] reverse = s.split("\r\n");
// 构造文件，原来那个文件
File file = new File("D:\\新建 文本文档.txt");
Writer writer = new FileWriter(file);
for(int i=reverse.length-1;i=0;i--){
//反转写入
writer.write(reverse[i]+"\r\n");
}
writer.close();
}
}
java难题，欢迎各位能够帮一下忙，谢谢各位帮忙
public interface Drinkable {
/**
* 饮用建议
*/
void drinkAdvice();
}
public class Wine implements Drinkable {
private String color;
@Override
public void drinkAdvice() {
}
public String showColor(){
System.out.println("酒的颜色：" + this.color);
return "酒的颜色：" + this.color;
}
public void setColor(String color) {
this.color = color;
}
}
public class Milk implements Drinkable {
private String flavor;
@Override
public void drinkAdvice() {
}
public String showFavor() {
System.out.println("牛奶风味：" + this.flavor);
return "牛奶风味：" + this.flavor;
}
public void setFlavor(String flavor) {
this.flavor = flavor;
}
}
public class Drinker {
public void toDrink(Drinkable drink, String str) {
if (drink instanceof Wine) {
Wine wine = (Wine) drink;
wine.setColor(str);
wine.showColor();
} else {
Milk milk = (Milk) drink;
milk.setFlavor(str);
milk.showFavor();
}
}
}
public class Test {
public static void main(String[] args) {
Drinkable wine = new Wine();
Drinkable milk = new Milk();
Drinker drinker = new Drinker();
drinker.toDrink(wine, "红色");
drinker.toDrink(milk, "原味");
}
}
Java 三道难题，希望大神详细解答。拜托拜托
三个题目一起贴代码太多了， 百度不允许贴这么多代码。 只能贴前面2题的代码
第一题：
import java.util.Scanner;
/**
* @author young
* @Description: TODO
* @date 2016年5月31日下午5:52:11
*/
public class Test {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Please input the number: ");
int num = sc.nextInt();
if (num 0 || num 1000000) {
System.out.println("Input Error");
System.exit(0);
} else {
String word = String.valueOf(num);
int i = word.length();// 获取长度
int j = 0;
while (j = (i / 2) - 1 word.charAt(j) == word.charAt(i - j - 1))
j++;
if (j == i / 2)
System.out.println("palindrome number.");
else
System.out.println("not palindrome number.");
sc.close();
}
}
}
第二题：
/**
* @author young
* @Description: TODO
* @date 2016年5月31日下午5:52:11
*/
public class Test {
public static void main(String[] args) {
int[] b = new int[50];
int sum = 0, avg = 0, t1 = 0, t2 = 0, t3 = 0,t4 = 0,t5 = 0;
for(int i = 0; i b.length; i++){
// b[i] = (int)((100)*Math.random());
b[i] = (int)(0+Math.random()*(100-0+1));
sum+=b[i];
if(b[i]=0 b[i] 60){
t1++;
}else if(b[i]=60 b[i] 70){
t2++;
}else if(b[i]=70 b[i] 80){
t3++;
}else if(b[i]=80 b[i] 90){
t4++;
}else if(b[i]=90 b[i] = 100){
t5++;
}
}
//每10行输出数组
int count = 1;
for(int i = 0; i b.length; i++){
System.out.format("%4s", b[i]);
count++;
if(count%10 == 0){
System.out.println();
count = 1;
}
}
//冒泡排序 从大到小
for (int k = 0; k b.length - 1; k++) {
for (int j = k + 1; j b.length; j++) { // 升序把改成
if (b[k] b[j]) {
int temp = b[k];
b[k] = b[j];
b[j] = temp;
}
}
}
System.out.println("\n最大值：" + b[0]);
System.out.println("最小值：" + b[49]);
System.out.println("平均值：" + (sum / 50));
System.out.println("[0,60)区间个数：" + t1);
System.out.println("[60,70)区间个数：" + t2);
System.out.println("[70,80)区间个数：" + t3);
System.out.println("[80,90)区间个数：" + t4);
System.out.println("[90,100]区间个数：" + t5);
}
}
java难题，请求各位高手帮助我解答一下，大家有难题互帮互助？
import java.util.Scanner;
interface Traffic{
double calc(double weight,double distance);//计算运费
}
class Trunk implements Traffic{
@Override
public double calc(double weight,double distance) {
return (distance=1000weight=60)?(weight*distance*120):(-1);
}
}
class Train implements Traffic{
@Override
public double calc(double weight, double distance) {
return (distance=900)?(weight*distance*250):(distance*weight*300);
}
}
class Plane implements Traffic{
@Override
public double calc(double weight, double distance) {
return (distance500)?(weight*distance*750):(-1);
}
}
class ZuChe{
private double distance;//距离
private double weight;//重量
public String useTraffic(Traffic t){
double result = t.calc(weight, distance);
return (result!=-1)?(""+result):(t.getClass().getName().equals(Trunk.class.getName())?"超重或者距离太远不能接单":"拒载");
}
public ZuChe setDistance(double distance) {
this.distance = distance;
return this;
}
public ZuChe setWeight(double weight) {
this.weight = weight;
return this;
}
}
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
double weight = sc.nextDouble();
double distance = sc.nextDouble();
ZuChe zuche = new ZuChe().setDistance(distance).setWeight(weight);
System.out.println("卡车的运费是:"+zuche.useTraffic(new Trunk()));
System.out.println("火车的运费是:"+zuche.useTraffic(new Train()));
System.out.println("飞机的运费是:"+zuche.useTraffic(new Plane()));
}
}
java超难题的介绍就聊到这里吧，感谢你花时间阅读本站内容，更多关于java比较难得问题、java超难题的信息别忘了在本站进行查找喔。