Operator ">" cannot be used comparing strings

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import java.util.Scanner;
public class ordenarNomes{
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String [] nomes = new String [20];

        for(int i=0;i<nomes.length;i++){
            System.out.println("Informe os nomes: ");
            nomes[i] = in.next();
        }
        String x = " ";
        for(int i=1;i<nomes.length-1;i++){
            for(int j=i+1;j<nomes.length;j++){
                if(nomes[i] > nomes[j]){
                    x = nomes[i];
                    nomes[i] = nomes[j];
                    nomes[j] = x;
                }
            }
        }
        for(int i=0;i<nomes.length;i++){
            System.out.print(nomes[i]+" ");
        }
    }    
}

Generating the following error:

The Operator > is Undefined for the argument type(s)

java string operators

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1 answer

3

In Java String is not a type of first class, so it has no operators, and you should compare with the method compareTo():

import java.util.Scanner;

class OrdenarNomes {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String[] nomes = new String[20];
        for (int i = 0; i < nomes.length; i++) {
            System.out.println("Informe os nomes: ");
            nomes[i] = in.next();
        }
        String x = " ";
        for (int i = 0; i < nomes.length - 1; i++) {
            for (int j = i + 1; j < nomes.length; j++) {
                if (nomes[i].compareTo(nomes[j]) > 0) {
                    x = nomes[i];
                    nomes[i] = nomes[j];
                    nomes[j] = x;
                }
            }
        }
        for (int i = 0; i < nomes.length; i++) System.out.print(nomes[i]+" ");
    }    
}

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

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  • At last for vi that removed the keys, it is only aesthetic or there is something more (better performance, for example)?

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