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Thread: Sorting lowercase strings before uppercase strings

  1. #1
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    Default Sorting lowercase strings before uppercase strings

    I can sort strings in a collection by uppercase and then lowercase though I was wondering if there is any way of doing it in reverse, sorting by lowercase then by uppercase.


  2. #2
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    Default Re: Sorting lowercase strings before uppercase strings

    Sure. Just use a custom Comparator.
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    Default Re: Sorting lowercase strings before uppercase strings

    	public int compare(String arg0, String arg1) {
    		for(int i=0;i<arg0.length() && i<arg1.length();i++) {
    			if((arg0.charAt(i) > 64 && arg0.charAt(i) < 91) || (arg0.charAt(i) > 97 && arg0.charAt(i) < 122)) {
    				if(arg0.charAt(i) < arg1.charAt(i)) return 1;
    				if(arg0.charAt(i) > arg1.charAt(i)) return -1;
    			} else {
    				if(arg0.charAt(i) < arg1.charAt(i)) return -1;
    				if(arg0.charAt(i) > arg1.charAt(i)) return 1;
    			}
    		}
    		return 0;
    	}


    --- Update ---

    Here is a sample usage:

    import java.util.ArrayList;
    import java.util.Collections;
    import java.util.Comparator;
    import java.util.List;
    public class Sorter implements Comparator<String>
    {
    	@Override
    	public int compare(String arg0, String arg1) {
    		for(int i=0;i<arg0.length() && i<arg1.length();i++) {
    			if((arg0.charAt(i) > 64 && arg0.charAt(i) < 91) || (arg0.charAt(i) > 97 && arg0.charAt(i) < 122)) {
    				if(arg0.charAt(i) < arg1.charAt(i)) return 1;
    				if(arg0.charAt(i) > arg1.charAt(i)) return -1;
    			} else {
    				if(arg0.charAt(i) < arg1.charAt(i)) return -1;
    				if(arg0.charAt(i) > arg1.charAt(i)) return 1;
    			}
    		}
    		return 0;
    	}
    	public static void main(String[] a) {
    		List<String> l = new ArrayList<String>();
    		l.add("String1");
    		l.add("STRING1");
    		l.add("STRING2");
    		l.add("String2");
    		/*Normal sort*/
    		Collections.sort(l);
    		System.out.println(l.toString());
    		/*Custom sort*/
    		Collections.sort(l, new Sorter());
    		System.out.println(l.toString());
    	}
    }

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Sorting lowercase strings before uppercase strings

    @dev73 Please read: The Problem with Spoon-feeding
    If you don't understand my answer, don't ignore it, ask a question.

  5. The Following User Says Thank You to Norm For This Useful Post:

    KevinWorkman (March 27th, 2014)

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    Default Re: Sorting lowercase strings before uppercase strings

    Thanks Norm. I agree with the rule.

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