Java interview sort code

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Random;
import java.util.Scanner;
import java.util.Set;


public class practiseJava11111 {
	
	
	//选择排序
	public static void SearchSort(int[] unsorted){		
		for (int i = 0; i < unsorted.length-1; i++) {
			for (int j = i+1; j < unsorted.length; j++) {
				if (unsorted[i]>unsorted[j]) {
					int temp = unsorted[i];
					unsorted[i] = unsorted[j];
					unsorted[j] = temp;
				}								
			}
		}
			
	}
	
	//冒泡排序
	public static void BubbleSort(int[] unsorted){
		for (int i = 0; i < unsorted.length-1; i++) {
			for (int j = 0; j < unsorted.length-1-i; j++) {
				if (unsorted[j]>unsorted[j+1]) {
					int temp = unsorted[j];
					unsorted[j] = unsorted[j+1];
					unsorted[j+1] = temp;
				}
			}
		}
	}
	
	
	//插入排序
	public static void InsertSort(int [] unsorted){
		for (int i = 1; i < unsorted.length; i++) {
			int temp = unsorted[i];
			int j = i - 1;
			while(j>=0 && temp<unsorted[j]){
				unsorted[j+1] = unsorted[j];
				j--;
			}
			unsorted[j+1] = temp;
		}
		
	}
	
	//快速查找
	public static int quickSort(int[] numbers, int start, int end){
        int temp = numbers[start]; //数组的第一个作为中轴
        while(start < end){
            while(start < end && numbers[end] > temp){
            	end--;
            }
            numbers[start] = numbers[end];//比中轴小的记录移到低端
            while(start < end && numbers[start] < temp){
            	start++;
            }
            numbers[end] = numbers[start] ; //比中轴大的记录移到高端
        }
        numbers[start] = temp ; //中轴记录到尾
        return start ; // 返回中轴的位置
		
	}
	
	
	
	//二分法查找
	public static int DoubleSearch(int[] arr, int key){
		int start = 0;
		int end = arr.length-1;
		while(start<=end){
			int middle = (start+end)/2;
			if (key<arr[middle]) {
				end = middle-1;
			}else if (key>arr[middle]) {
				start = middle+1;
			}else {
				return middle;
			}

		}
		return -1;
		
	}
	
	public static void OperateDoubleSearch(){
		int[] arr = new int[] { 12, 23, 34, 45, 56, 67, 77, 89, 90 };
		System.out.println(DoubleSearch(arr, 12));
		System.out.println(DoubleSearch(arr, 45));
		System.out.println(DoubleSearch(arr, 89));
	}
	
	
	//传入多个参数，都返回string
	public String getstring(Object object){
		if (object == null) {
			return null;
		}else {
			return new String(object.toString());
		}
		
	}
	
	public void getString(Object...objects){
		if (objects.length<=0) {
			System.out.println("传入的参数为空！！！！！！！");
		}else {
			for (int i = 0; i < objects.length; i++) {
				String str = objects[i].toString();
				System.out.println("输出的字符串是："+str);
				System.out.println(str.getClass().getName());
			}
		}
	}
	
	public<E> void gettoString(E...object){
		for (int i = 0; i < object.length; i++) {
			System.out.println(object[i].toString());
		}
		for (E element : object) {
			System.out.println(element.toString());
		}
	}
	
	

	//将一个字符串反转
	public void reverseString(String str){
		System.out.println("最初的 字符串是："+str);
		String newstr = "";
		for (int i = 0; i < str.length(); i++) {
			char c = str.charAt(str.length()-1-i);
			newstr = newstr + c;
		}
		System.out.println("反转后的字符串是："+newstr);

	}

	
	//复制文件
	public void CopyFile (String oldfilePath, String newfilePath) throws IOException{
		File oldfile = new File(oldfilePath);
		File newfile = new File(newfilePath);
		FileInputStream fis = new FileInputStream(oldfile);
		FileOutputStream fos = new FileOutputStream(newfile);
		int read = 0;
		while((read = fis.read())!=-1){
			fos.write(read);
			fos.flush();
		}
		fos.close();
		fis.close();
	}
	

	//将一句话的单词首字母大写
	public void UpperCase(String str){
		char[] c = str.toCharArray();
		if (c[0]>='a'&&c[0]<='z') {
			c[0] = (char)(c[0] - 32);
		}
		for (int i = 1; i < c.length; i++) {
			if (c[i] == ' ') {
				c[i+1] = (char)(c[i+1] - 32);
			}
		}
		String UpperCaseStr = new String(c);
		System.out.println("将字符串单词首字母大写之后： " + UpperCaseStr);
	}
	
	
	
	
	//输入年月日，输出是这一年的第几天
	public static void getDayInYear(int year, int month ,int day){
		int counts = 0;   int days = 0;
		if (year>0&&month>0&&month<13&&day>0&&day<32) {
			for (int i = 0; i < month; i++) {
				switch (i) {
				case 1:
				case 3:
				case 5:
				case 7:
				case 8:
				case 10:
				case 12:
					days = 31;
					break;
				case 4:
				case 6:
				case 9:
				case 11:
					days = 30;
					break;
				case 2:
					if ((year%4==0&&year%100==0)||(year%400==0)) {
						days = 29;
					}else {
						days = 28;
					}
					break;
				}
				counts = counts + days;	
			}
			System.out.println("是这一年的第 " + counts);
						
		}else {
			System.err.println("参数年月日有问题！！！！！！");
		}
	}
	
	
	//将一段字符串中个字符的数量非农额打印出
	public void printCharSum(){
		int countNum = 0;
		int countWord = 0;
		int countBlank = 0;
		int countOther = 0;
		Scanner in = new Scanner(System.in);
		System.out.println("请输入字符串！");
		String str = in.nextLine();
		char [] c = str.toCharArray();
		for (int i = 0; i < c.length; i++) {
			if (c[i]>=0 && c[i] <=9) {
				countNum ++;
			}else if ((c[i]>='a'&&c[i]<='z')||(c[i]>='A'&&c[i]<='Z')) {
				countWord ++;
			}else if (c[i]==' ') {
				countBlank ++;
			}else {
				countOther ++;
			}
		}
		
		System.out.println("数字个数是 ： " + countNum);
		System.out.println("数字个数是 ： " + countWord);
		System.out.println("数字个数是 ： " + countBlank);
		System.out.println("数字个数是 ： " + countOther);
		
	}
	
	

	
	//计算出各个字符的个数
	public static void getCharNum(String[] args) {
		Set<Character> set =new HashSet<Character>();
		String str = "l love you !";
		for (int i = 0; i < str.length(); i++) {
			set.add(str.charAt(i));
		}
		Iterator<Character>  it = set.iterator();
		while (it.hasNext()){
			Character c = (Character)it.next();
			int k= 0;
			for (int j = 0; j < str.length(); j++) {
				if (c.equals(str.charAt(j))) {
					k++;
				}
			}
			System.out.println(c + "有" + k +"个");
		}		
		//set.size();
	}
	
	
	//红绿灯
	public enum Signal{
		green, yellow, red
	}
	
	public static class trafficLight{
		public Signal signal = null;
		public Signal getSignalColor(Signal signal) throws InterruptedException{
			switch(signal){
			case red:
				Thread.sleep(5000);
				signal = Signal.green;
			    break;
			case green:
				Thread.sleep(5000);
				signal = Signal.yellow;
				break;
			case yellow:
				Thread.sleep(5000);
				signal = Signal.red;
				break;
				
			}
			return signal;	
		}		
		
	}
	
	
	//递归阶乘
	public static long jiecheng(int i ){
		if (i==0||i==1) {
			return 1;
		}else {
			return i*jiecheng(i-1);
		}
	}
	
	public static long jiecheng1(int i){
		int j = 1;
		if (i==0||i==1) {
			return 1;
		}else {
			for (int k=i; k>= 2; k--) {
				j = j*i;
			}
		}
		return j ;	

	}
	
	//单例模式
	public static class Test{
		private Test(){};
		private static Test test;
		public static Test geTestInstance(){
			if (test ==null) {
				test = new Test();
			}
			return test;
		}

	}
	
	
	//打印随机函数
	public void printRandom(){
		int[] numbers = {1,0,5,4,3,42,71,25,6};
		Random random = new Random();
		int newIndex = random.nextInt(numbers.length);
		System.out.println(numbers[newIndex-1]);
	}
	
	public void printRandomforTime(int time){
		long begin = System.currentTimeMillis();		
		
		while(true){
			printRandom();
			long end = System.currentTimeMillis();
			if ((end-begin)>=time*1000) {
				System.out.println("运行了" + time + "秒之后结束运行");
				break;
			}
			
		}
		
	}
	
	
	//水仙花     百位的3次方 + 十位的3次方 + 个位的3次方 = 这个数
	public void printWaterFlower(){
		int a,b,c;
		for (int i = 100; i < 1000; i++) {
			a = i/100;
			b = i%100/10;
			c = i%10;
			if ((a*a*a + b*b*b + c*c*c)==i) {
				System.out.println(i + "是一个水仙花数");
			}
		}
		
	}
	
	
	//乘法口诀
	public void chenfa(){
		for (int i = 1; i < 10; i++) {
			for (int j = 1; j <=i; j++) {
				System.out.println(i + "*" +j +'='+ i*j + " ");
				if (i*j<10) {
					System.out.println(" ");
				}
			}
			System.out.println();
		}
	}
	
	
	//将1,2,3,4,5这5个数字可组成多少个无重复的四位数
	public void createNumbers(){
		int count = 0;
		for (int a = 1; a <=5; a++) {
			for (int b = 1; b <=5; b++) {
				for (int c = 1; c <=5; c++) {
					for (int d = 1; d <=5; d++) {
						if ((a!=b)&&(a!=c)&&(a!=d)&&(b!=c)&&(b!=d)&&(c!=d)) {
							count ++;
							System.out.println(a*1000 + b*100 + c*10 + d);
						}
					}
				}
			}
		}
		System.out.println("可组成"+ count +"个无重复的四位数");
	}
	
	
	 /** 
	   * 判断两个文件的内容是否相同，文件名要用绝对路径 
	   * @param fileName1 ：文件1的绝对路径 
	   * @param fileName2 ：文件2的绝对路径 
	   * @return 相同返回true，不相同返回false 
	   */  
	public boolean isSameFile(String fileName1,String fileName2){  
	    FileInputStream fis1 = null;  
	    FileInputStream fis2 = null;  
	    try {  
	        fis1 = new FileInputStream(fileName1);  
	        fis2 = new FileInputStream(fileName2);  
	          
	        int len1 = fis1.available();//返回总的字节数  
	        int len2 = fis2.available();  
	          
	        if (len1 == len2) {//长度相同，则比较具体内容  
	            //建立两个字节缓冲区  
	            byte[] data1 = new byte[len1];  
	            byte[] data2 = new byte[len2];  
	              
	            //分别将两个文件的内容读入缓冲区  
	            fis1.read(data1);  
	            fis2.read(data2);  
	              
	            //依次比较文件中的每一个字节  
	            for (int i=0; i<len1; i++) {  
	                //只要有一个字节不同，两个文件就不一样  
	                if (data1[i] != data2[i]) {  
	                    System.out.println("文件内容不一样");  
	                    return false;  
	                }  
	            }  
	            System.out.println("两个文件完全相同");  
	            return true;  
	        } else {  
	            //长度不一样，文件肯定不同  
	            return false;  
	        }  
	    } catch (FileNotFoundException e) {  
	        e.printStackTrace();  
	    } catch (IOException e) {  
	        e.printStackTrace();  
	    } finally {//关闭文件流，防止内存泄漏  
	        if (fis1 != null) {  
	            try {  
	                fis1.close();  
	            } catch (IOException e) {  
	                //忽略  
	                e.printStackTrace();  
	            }  
	        }  
	        if (fis2 != null) {  
	            try {  
	                fis2.close();  
	            } catch (IOException e) {  
	                //忽略  
	                e.printStackTrace();  
	            }  
	        }  
	    }  
	    return false;  
	}  
	

}