Java实验三(2019大数据)

练习1
1.在给定的程序Lab0301.java中补充代码实现计算一个字符串中单词的数量的功能。
2.添加一个新方法
private static String getFirstWord(String input)
该方法把一个字符串作为参数，返回这个字符串的第一个单词。
3.在给定的程序Lab03.java中实现计算一个字符串中单词的数量的功能。

package practice;
import java.util.Scanner;
public class testone {
	private static String Getone(String input) {
		int i = input.indexOf(" ");
		String b = input.substring(0,i);
		return b;
	}
	public static void main(String[] args){
		Scanner aa = new Scanner(System.in);
		String s ="I love book,i really love book";
		//s = " "+s+" ";
		//String ts ="book";
		//int num = s.split(ts).length-1;
		//System.out.println(num);
		System.out.println(Getone(s));
	}
}

练习2
1.补充Lab0302.java，从键盘上接收一个字符串，经过ROT-13加密算法后，以下面格式显示在输出设备上：
±---------------------------------------------------------+
| 原始数据: THE QUICK BROWN FOX JUMPED OVER THE LAZY DOG. |
| 加密数据: GUR DHVPX OEBJA SBK WHZCRQ BIRE GUR YNML QBT. |
±---------------------------------------------------------+
2.添加方法，指定加密算法的移动位数，实现ROT算法

package practice;

import java.util.Scanner;

public class testtwo {
	private static String Wordx(String test) {
		String password = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
		String passwd = "abcdefghijklmnopqrstuvwxyz";
		//StringBuffer output = new StringBuffer();
		String output=new String();
		for(int i=0;i<test.length();i++) {
			/*String c = test.substring(i, i+1);
			int temp = password.indexOf(c)%52;
			String tnew = password.substring(temp+13,temp+14);
			//output.append(tnew);
			output = output + tnew;*/
			char ch=test.charAt(i);
			//Character chh = new Character(ch);
			String chs = String.valueOf(ch);
			if(ch == ' ') {
				output = output +chs;
			}else {
				if(Character.isUpperCase(ch)) {
					int num = password.indexOf(chs);
					int nnum = (num+13)%26;
					String tnew = password.substring(nnum,nnum+1);
					output = output + tnew;
				}else {
					int num = passwd.indexOf(chs);
					int nnum = (num+13)%26;
					String tnew = passwd.substring(nnum,nnum+1);
					output = output + tnew;
				}
			}
		}
		//return new String(output);
		return output;
	} 
	public static void displayResults(String inText,String encText) {
		System.out.print("+---------");
		for(int i=0;i<inText.length();i++) {
			System.out.print("-");
		}
		
		System.out.println("--+");
		System.out.print("| ");
		System.out.print("原始数据: ");
		System.out.print(inText);
		System.out.println("  |");
		
		System.out.print("| ");
		System.out.print("加密数据: ");
		System.out.print(encText);
		System.out.println("  |");
		
		System.out.print("+---------");
		for(int i=0;i<inText.length();i++) {
			System.out.print("-");
		}
		
		System.out.print("--+");
	}
	public static void main(String[] args){
		//String paaword = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
		Scanner aa = new Scanner(System.in);
		System.out.println("请输入字符串:");
		String s = aa.nextLine();
		displayResults(s,Wordx(s));
	}
}