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public class ObjectInsertSort {
private Person[] a;
private int nElems;
public ObjectInsertSort(int max) {
a = new Person[max];
nElems = 0;
}
// put person into array
public void insert(String last, String first, int age) {
a[nElems] = new Person(last, first, age);
nElems++;
}
public void display() {
for (int j = 0; j < nElems; j++)
a[j].displayPerson();
}
public void insertionSort() {
int in, out;
for (out = 1; out < nElems; out++) {
Person temp = a[out]; // out is dividing line
in = out; // start shifting at out
while (in > 0 && // until smaller one found,
a[in - 1].getLast().compareTo(temp.getLast()) > 0) {
a[in] = a[in - 1]; // shift item to the right
--in; // go left one position
}
a[in] = temp; // insert marked item
}
}
public static void main(String[] args) {
int maxSize = 100; // array size
ObjectInsertSort arr;
arr = new ObjectInsertSort(maxSize); // create the array
arr.insert("Jo", "Yin", 24);
arr.insert("Pengzhou", "Yin", 59);
arr.insert("James", "Chen", 37);
arr.insert("Chirs", "Paul", 37);
arr.insert("Rob", "Tom", 43);
arr.insert("Carlo", "Sato", 21);
arr.insert("Al", "Henry", 29);
arr.insert("Nancy", "Jose", 72);
arr.insert("Vang", "Minh", 22);
System.out.println("Before sorting:");
arr.display(); // display items
arr.insertionSort(); // insertion-sort them
System.out.println("After sorting:");
arr.display(); // display them again
}
}
class Person {
private String lastName;
private String firstName;
private int age;
public Person(String last, String first, int a) {
lastName = last;
firstName = first;
age = a;
}
public void displayPerson() {
System.out.print(" Last name: " + lastName);
System.out.print(", First name: " + firstName);
System.out.println(", Age: " + age);
}
public String getLast() {
return lastName;
}
}
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