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insertion sort in java

master
wgroeneveld 2018-03-21 20:45:02 +01:00
parent 171be3c3bb
commit d4f89afb17
5 changed files with 145 additions and 46 deletions
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105
dictee/java/.idea/workspace.xml
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@ -15,8 +15,8 @@
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24
sorting/java/sorting.iml Normal file
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32
sorting/java/src/be/brainbaking/sorting/InsertionSort.java Normal file
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@ -0,0 +1,32 @@
package be.brainbaking.sorting;
import java.util.ArrayList;
import java.util.List;
public class InsertionSort implements Sortable {
public List<Integer> sort(List<Integer> list) {
// not the same thing, I don't want to mutate the incoming list.
// start with nothing and insert it into the right position of result list.
// ex. https://www.geeksforgeeks.org/insertion-sort/
List<Integer> result = new ArrayList<>();
result.add(list.get(0));
for(int i = 1; i < list.size(); i++) {
int curr = list.get(i);
boolean added = false;
for(int j = 0; j < result.size(); j++) {
if(result.get(j) > curr) {
result.add(j, curr);
added = true;
break;
}
}
if(!added) result.add(curr);
}
return result;
}
}

8
sorting/java/src/be/brainbaking/sorting/Sortable.java Normal file
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@ -0,0 +1,8 @@
package be.brainbaking.sorting;
import java.util.List;
public interface Sortable {
List<Integer> sort(List<Integer> list);
}

22
sorting/java/test/be/brainbaking/sorting/SortTest.java Normal file
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@ -0,0 +1,22 @@
package be.brainbaking.sorting;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import java.util.Arrays;
import java.util.List;
public class SortTest {
@Test
public void insertionSort() {
simpleTestCaseFor(new InsertionSort());
}
private void simpleTestCaseFor(Sortable sorter) {
List<Integer> result = sorter.sort(Arrays.asList(4, 2, 3, 1, 6, 5));
Assertions.assertArrayEquals(Arrays.asList(1, 2, 3, 4, 5, 6).toArray(), result.toArray());
}
}