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Updates from March, 2012 Toggle Comment Threads | Keyboard Shortcuts

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  MohanaRao SV 3:22 pm on March 18, 2012 Permalink | Reply
  Tags: Java   

  Method to count number of repeated special characters in a given String. 

   public Map<Character, Integer> charIntMap(String str) {	Map<Character, Integer> map = new HashMap<Character, Integer>();	char[] charString = str.toCharArray();	int count = 1;	for (int i = 0; i < (charString.length - 1); i++) {	if (!Character.isLetter(charString[i])) {	if (!map.containsKey(charString[i])) {	map.put(charString[i], count);	} else {	map.put(charString[i], count++);	}	}	}	return map;	} 

   

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  MohanaRao SV 1:02 am on March 12, 2012 Permalink | Reply
  Tags: core java.   

  Example for overriding Hashcode and Equals methods. 

  Whenever you are working with the collections HashMap, HashSet then you have to override pojo hashcode and equals method.

   package com.stackoverflow.java.core; import java.util.HashMap; import java.util.Map; public class Employee {	private String name;	private String sex;	private int salary;	private int age;	public String getName() {	return name;	}	public void setName(String name) {	this.name = name;	}	public String getSex() {	return sex;	}	public void setSex(String sex) {	this.sex = sex;	}	public int getSalary() {	return salary;	}	public void setSalary(int salary) {	this.salary = salary;	}	public int getAge() {	return age;	}	public void setAge(int age) {	this.age = age;	}	@Override	public int hashCode() { //Not taken care when genrating hashcode.	int hashcode = this.age * 2 + this.salary * 2;	return hashcode;	}	@Override	public boolean equals(Object obj) {	if (this == obj)	return true;	if (obj == null)	return false;	if (getClass() != this.getClass())	return false;	Employee employee = (Employee) (obj);	if ((this.name.equals(employee.name) && (this.sex.equals(employee.sex)	&& (this.age == employee.age) && (this.salary == employee.salary)))) {	return true;	} else {	return false;	}	}