An implementation instance of java string concatenation

An implementation instance of java string concatenation

In real development, dealing with strings is the most common programming task. This topic is to require the program to user input string processing. Specific rules are as follows:

Capitalize the first letter of each word.
2. Separate the Numbers from the letters with an underscore character (_) for clarity
3. Change the number of Spaces in the middle of a word to one.

Such as:

User input:

you and me what cpp2005program

Program output:

You And Me What Cpp_2005_program

User input:

this is a 99cat

Program output:

This Is A 99_cat

We assume that the string entered by the user contains only lowercase letters, Spaces, and Numbers, and no other letters or symbols. Each word is separated by one or more Spaces.
Assume that the user enters a string of no more than 200 characters in length.

The examinee is required to write all the classes in one document. After debugging, it can be stored in the "Answer. txt" corresponding to the question number under the examinee folder. Do not copy the relevant project documents. Do not use the package statement.

In addition, only the syntax or calls allowed in JDK1.5 can appear in the source program. Version 1.6 or later is not available.

Implementation examples:

 
import java.util.ArrayList; 
import java.util.Scanner; 
 
//you and   me what cpp2005program 
// Program output:  
//You And Me What Cpp_2005_program 
 
public class Main { 
  public static void main(String[] args){ 
    String x = new Scanner(System.in).nextLine(); 
    combineStr(x); 
  } 
 
  public static void combineStr(String x){ 
     
    // Gets the processed data set  
    ArrayList<String> list = repair(x); 
 
    // A string used to determine a number  
    String intStr = "0123456789"; 
 
    // Gets each string for a character concatenation conversion  
    String result = ""; 
    for(int i=0;i<list.size();i++){ 
      // Take out the 1 A character  
      String temp = list.get(i); 
       
      // Initialize the resulting value  
      result = temp; 
     
      // Make numerical and alphabetic judgments  
      for(int k=0;k<temp.length()-1;k++){ 
         
        if(intStr.indexOf(temp.charAt(k))!=-1 && intStr.indexOf(temp.charAt(k+1))==-1){   //  The judgment condition is a number  
          // 8a   Returns the replaced character, unchanged  
          result = result.replace(temp.substring(k, k+2), (temp.charAt(k)+"_"+temp.charAt(k+1))); 
       
        }else if(intStr.indexOf(temp.charAt(k))==-1 && intStr.indexOf(temp.charAt(k+1))!=-1){  // An alphanumeric  
           
          result = result.replace(temp.substring(k, k+2), (temp.charAt(k)+"_"+temp.charAt(k+1))); 
   
        } 
      } 
      System.out.print(result+" "); 
    } 
  } 
 
  // Gets user input and removes duplicate white space characters  
  public static ArrayList<String> repair(String x){ 
     
    // Save the word after the first character is capitalized  
    ArrayList<String> list = new ArrayList<String>(); 
     
    // A string used to determine a number  
    String intStr = "0123456789"; 
 
    String[] arr = x.split(" "); 
 
    for(int i=0;i<arr.length;i++){ 
      if(!arr[i].equals("")){ 
        // For each 1 Three characters to judge  
        if( intStr.indexOf(arr[i].charAt(0))==-1){  //  The corresponding characters are letters rather than Numbers ,==-1 If no number is found, it is a letter  
          String newString = (arr[i].charAt(0)+"").toUpperCase()+arr[i].substring(1); 
          list.add(newString); 
        }else{ 
          list.add(arr[i]); 
        } 
      } 
    } 
    return list; 
  } 
} 

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