java - How can I sort a collection of custom entities? -

i have list of custom entities need sort in order: valueone, valuetwo, , valuethree.

here code

public class apprunner {     public static void main(string[] args) {          detail d1 = new detail("valueone");         detail d2 = new detail("valuetwo");         detail d3 = new detail("valuefive");         detail d4 = new detail("valueten");         detail d5 = new detail("valueone");         detail d6 = new detail("valueone");          list<detail> details = new arraylist<detail>(arrays.aslist(d1, d2, d3, d4, d5, d6));          collections.sort(details);         system.out.println(details);     } } 

my entity class

public class detail implements comparable<detail> {      private string value; // there 3 options: valueone, valuetwo, , other value      public detail(string value) {         this.value = value;     }      @override     public int compareto(detail detail) {         string val = detail.getvalue();         if (val.equals(this.value) && val.equals("valueone")) {             return 1;         } else if (val.equals(this.value) && val.equals("valuetwo")) {             return -1;         } else {             return 0;         }     }     // getter, setters, tostring } 

i think need compareto method. in end need list in order:

1. valueone
2. valueone
3. valueone
4. valuetwo
5. valuefive

use enum , compare ordinals:

enum validvalues { valueone, valuetwo, valuethree } 

... , then:

public int compareto(object detail) {     return integer.compare(validvalues.valueof(this.value).ordinal(),                            validvalues.valueof(((detail)detail).value).ordinal()); } 

for larger number of values might worth collection or map, rather enum.