what? Can you please explain?
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Java Selection Sort Using Object
I have to make a selection sort in Java using an object array. This is the code I have so far:
public static void selectionSort(Object[] array3) {
//TODO: implement a linear search
for (int i = 0; i < array3.length - 1; i++){
for (int j = i+1; j < array3.length; j++){
if (array3[i] > array3[j]){
int temp = array3[i];
array3[i] = array3[j];
array3[j] = temp;
}
}
}
}
I'm using NetBeans IDE 6.7.1 and there's a red error line underneath the following line:
if (array3[i] > array3[j]){
And the error is "operator > cannot be applied to java.lang.Object, java.lang.Object
Can anyone help me write this? I'm a newbie with Java writing this for a class assignment.
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Answers
public static void selectionSort(Object[] array3) {
// TODO: implement a linear search
for (int i = 0; i < array3.length - 1; i++) {
for (int j = i + 1; j < array3.length; j++) {
if ((Integer)array3[i] > (Integer)array3[j]) {
int temp = (Integer)array3[i];
array3[i] = array3[j];
array3[j] = temp;
}
}
}
}
Ok, the error went away, but the test class I wrote is giving me an error:
public void testSelectionSort() {
System.out.println("select
Object[] array3 = new Object[10];
array3[0] = "charlie";
array3[1] = "gila";
array3[2] = "alpha";
array3[3] = "zulu";
array3[4] = "yankee";
array3[5] = "whiskey";
array3[6] = "november";
array3[7] = "romeo";
array3[8] = "bravo";
array3[9] = "hotel";
MyArrays.selectionSort(arr
System.out.println("Sorted
for (int k = 0; k < array3.length; k++)
System.out.println("Array "+ (k + 1) + ": " + array3[k]);
// TODO review the generated test code and remove the default call to fail.
}
Any ideas?
Read this, look for "Casting Objects" section.
http://java.sun.com/docs/b
That didn't help. I tried using casting in the test method (below) basically adding MyArrays.selectionSort(Int
public void testSelectionSort() {
System.out.println("select
Object[] array3 = new Object[10];
array3[0] = "charlie";
array3[1] = "gila";
array3[2] = "alpha";
array3[3] = "zulu";
array3[4] = "yankee";
array3[5] = "whiskey";
array3[6] = "november";
array3[7] = "romeo";
array3[8] = "bravo";
array3[9] = "hotel";
MyArrays.selectionSort((In
System.out.println("Sorted
for (int k = 0; k < array3.length; k++)
System.out.println("Array "+ (k + 1) + ": " + array3[k]);
// TODO review the generated test code and remove the default call to fail.
}
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by: afibarraPosted on 2009-11-05 at 12:23:17ID: 25753542
You need to "cast" your array elements to an Integer type.