We all know that String class is Immutable. I recently got a Question in an interview that...How to make a String class mutable? Is it possible to make a String class Mutable??? pete stein Bartender Posts: 1561 posted 14 years ago I'd use StringBuilder if I needed a class ...
arpit.java2blog.bean; import java.util.ArrayList; public final class Country { // declared private final instance variable private final String countryName; // Mutable object private final ArrayList listOfStates; public Country(String countryName, ArrayList listOfStates) { super(); this.country...
There are examples of immutable built-in Java classes such as the primitive wrapper classes (Byte, Short, Integer, Long, Float, Double, Character, and Boolean), and BigInteger and BigDecimal. Rules to create immutable class: In order to make a Java class immutable, follow these rules. ...
*/ public final void setAccountNumber(int aNewAccountNumber) { validateAccountNumber(aNewAccountNumber); fAccountNumber = aNewAccountNumber; } public final void setDateOpened(Date aNewDate) { // make a defensive copy of the mutable date object Date newDate = new Date(aNewDate.getTime()); ...
Java program to create a mutable list This program creates a mutable list. // Importing the required classesimportjava.util.ArrayList;importjava.util.Arrays;importjava.util.List;// Creating main classpublicclassMain{publicstaticvoidmain(String args[]){// Creating a mutable listList<Integer>list=...
To compare different methods of copying Java objects, we’ll need two classes to work on: classAddress{privateString street;privateString city;privateString country;// standard constructors, getters and setters} classUser{privateString firstName;privateString lastName;privateAddress address;// standard...
ConfigurableEnvironment env = new StandardEnvironment(); MutablePropertySources props = env.getPropertySources(); Map map = new HashMap(); map.put("key", "value"); props.addFirst(new MapPropertySource("Map", map)); We’ve created a map linking a key to a value then add that map toPr...
@Retention(RetentionPolicy.RUNTIME) @interface Secured { String requiredUser(); } When using this miniature framework, a user can annotate methods with@Securedin order to expect them to only be invokable on condition that the specified user is logged on. But how do we enforce this rule? It ...
Map<String,String>mutableMap=newHashMap<String,String>();mutableMap.put("Name","John");mutableMap.put("Age","30");mutableMap.put("Grade","A");Map<String,String>immutableMap=Collections.unmodifiableMap(mutableMap); If we try to modify the immutable Map, we will getjava.lang.UnsupportedOper...
Add a Java library for accessing document scanners using Dynamic Web TWAIN Service’s REST APIs. The library was built in aprevious Java document scanner blog. dependencies{implementation'com.github.tony-xlh:docscan4j:v2.0.0'} Add Permissions ...