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| public class Array2DExemple {
public static void main(String[] args) {
String[][] data = new String[][] {
{"voiture","camion","helicoptere"},
{"chien","chat","tigre"},
{"assiette","verre","fourchette"},
{"patate","haricots","tomates"}
};
System.out.println("avant");
println(data);
data = mySort(data);
System.out.println("après");
println(data);
}
private static void println(String[][] data) {
for(String[] line : data ) {
System.out.println(Arrays.toString(line));
}
}
private static String[][] mySort(String[][] data) {
String[][] transposed = transpose(data);
sort(transposed);
return transpose(transposed);
}
private static void sort(String[][] data) {
Arrays.sort(data, new Comparator<String[]>() {
@Override
public int compare(String[] a1, String[] a2) {
return a1[0].compareTo(a2[0]);
}
});
}
private static String[][] transpose(String[][] data) {
String[][] transposed = new String[data[0].length][data.length];
for(int i=0; i<data.length; i++) {
for(int j=0; j<data[i].length; j++) {
transposed[j][i]=data[i][j];
}
}
return transposed;
}
} |
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