comparable interfacee
class Student implements Comparable<Student>{
int rollno;
String name;
int age;
Student(int rollno,String name,int age){
this.rollno=rollno;
this.name=name;
this.age=age;
}
public int compareTo(Student st){
if(age==st.age)
return 0;
else if(age>st.age)
return 1;
else
return -1;
}
}comparable on a generic class java
public class DoubleKey<K extends Comparable<K>, J extends Comparable<J>>
implements Comparable<DoubleKey<K, J>> {
private K key1;
private J key2;
public DoubleKey(K key1, J key2) {
this.key1 = key1;
this.key2 = key2;
}
public K getFirstKey() {
return this.key1;
}
public J getSecondKey() {
return this.key2;
}
public int compareTo(DoubleKey<K, J> that) {
int cmp = this.getFirstKey().compareTo(that.getFirstKey());
if (cmp == 0)
cmp = this.getSecondKey().compareTo(that.getSecondKey());
return cmp;
}
}comparable interface java
public class BinarySearchTree< T extends Comparable<T>> {
Node root;
class Node {
T data;
Node left;
Node right;
public Node(T data) {
this.data = data;
}
}
public boolean isEmpty() {
return root == null;
}
public void insert(T value) {
if(isEmpty())
root = new Node(value);
else
insert(root, value);
}
private void insert(Node node, T value) {
if(value.compareTo(node.data) < 0) {
if(node.left == null)
node.left = new Node(value);
else
insert(node.left, value);
}
else {
if(node.right == null)
node.right = new Node(value);
else
insert(node.right, value);
}
}
}Copyright © 2021 Codeinu
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