How exactly do I separate a single grouping of numbers in Java in a string of digits that contains more than 1 or 2 digits? For example, I need to only separate the digits in the groups larger than 1 or 2 digits in this string: 12,10,12914,10,641,10,11,11,2,10.

Also, how can I separate/split certain elements in an array in Java without separating all of the elements? For example, I need to separate the letters from the numbers, and separate the 12 from the 9, and the 6 from the 4 in this set of elements: [12a, 129, 14a, 64, 1a, 11b, 2a].

Thanks for any help!

CodePudding user response：

You could split the string since they are comma separate and then loop through each of the numbers and separate only those that meet your criteria.

   String str = "12,10,12914,10,641,10,11,11,2,10";
   str[] ary = str.split(",");
   for (str s : ary) {
     if ( s.length() > 1 ) {
       //separate the contents of the string as you want
     }
   }

CodePudding user response：

You can do it like this.

In the first case:

• split the string on , possibly surrounded by white space.
• filter strings > length of 2
• convert to an Integer and store in a list.

String s1 = "12,10,12914,10,641,10,11,11,2,10";

List<Integer> list1 = Arrays.stream(s1.split("\\s*,\\s*"))
        .filter(str -> str.length() > 2).map(Integer::valueOf)
        .toList();

System.out.println(list1);

Prints

[12914, 641]

In the second case

• split the same way as before.
• convert the string sans the last character (letter or digit) to an integer. This uses the String.substring method.
• return in a list.

String s2 = "2a, 129, 14a, 64, 1a, 11b, 2a";
List<Integer> list2 = Arrays.stream(s2.split("\\s*,\\s*"))
        .map(str -> Integer.valueOf(
                str.substring(0, str.length() - 1)))
        .toList();
System.out.println(list2);

Prints

[2, 12, 14, 6, 1, 11, 2]

In the second case an exception will be thrown if the items end in more than one non-digit character or are not at least 2 in length.

CodePudding user response：

If it helps you

public class Main
{
    
    public static String example1(int[] in) {
        
        String msg = "Example 1\n";
        
        for(int idx=0; idx<in.length; idx  ) {
            
            msg  = in[idx]   ":";
            String str=String.valueOf(in[idx]);
            boolean split = false;
            
            for(int i=1; i<str.length(); i  ) {
                
                char x = str.charAt(i-1);
                char y = str.charAt(i);
                
                
                if (x!=y && i == 1) {
                    
                    msg  = " "   x;
                    
                } 
                
                if (x!=y) { 
                    
                    msg  = " "   y;
                    
                }
                
                
                
            }
            
            msg  = "\n";
            
        }
        
        msg  = "Done";
        return msg;
        
    }
    
    public static void main(String[] args) {

        int[] in = new int[] {12,10,12914,10,641,10,11,11,2,10};        
        String msg = example1(in);
        System.out.println(msg);
        
    }
    
}