如何使用java基於字母數字值進行排序？

Question

我有3個值一樣

a^100,b^200,c^150 

我需要這些值的

b^200,c^150,a^100 

順序我怎樣才能在Java中做這樣？

Answer 1

使用自定義Comparator，像這樣的：

public class IntegerSubstringCompare implements Comparator<String> { 
    @Override 
    public int compare(String left, String right) { 
     Integer leftInt = Integer.parseInt(left.substring(left.indexOf("^") + 1)); 
     Integer rightInt = Integer.parseInt(right.substring(right.indexOf("^") + 1)); 

     return -1 * leftInt.compareTo(rightInt); 
    } 
} 

您可以使用它像這樣：

public static void main(String[] args) { 
    String[] input = {"a^100", "b^200", "c^150"}; 
    List<String> inputList = Arrays.asList(input); 
    Collections.sort(inputList, new IntegerSubstringCompare()); 
    System.out.println(inputList); 
} 

Answer 2

String sample = "a^100,b^200,c^150"; 
List data = Arrays.asList(sample.split(",")); 
Collections.sort(data, Collections.reverseOrder(new Comparator<String>() { 
public int compare (String obj1,String obj2) 
{ 
    String num1 = obj1.split("\\^")[1]; 
    String num2 = obj2.split("\\^")[1]; 
    return num1.compareTo(num2); 
} 
})); 
String sortedSample[]= (String[])data.toArray(new String[data.size()]); 
for (int z=0; z< sortedSample.length;z++) 
System.out.println(sortedSample[z]);