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How to answer conflict-resolution interview questions

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Why do I need to override the equals and hashCode methods in Java?

  Imagine you have this MyClass first = new MyClass( "a" , "first" ); MyClass second = new MyClass( "a" , "second" ); Override only  equals If only  equals  is overriden, then when you call  myMap.put(first,someValue)  first will hash to some bucket and when you call  myMap.put(second,someOtherValue)  it will hash to some other bucket (as they have a different  hashCode ). So, although they are equal, as they don't hash to the same bucket, the map can't realize it and both of them stay in the map. Although it is not necessary to override  equals()  if we override  hashCode() , let's see what would happen in this particular case where we know that two objects of  MyClass  are equal if their  importantField  is equal but we do not override  equals() . Override only  hashCode If you only override  hashCode  then when you call  myMap.put(first,someValue)  it takes first, calculates its  hashCode  and stores it in a given bucket. Then wh
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Java Logger

In Java, logging is an important feature that helps developers to trace out the errors. Java is the programming language that comes with the logging approach. It provides a Logging API that was introduced in Java 1.4 version. It provides the ability to capture the log file. In this section, we are going to deep dive into the Java Logger API. Also, we will cover logging level, components, Logging handlers or appenders, logging formatters or layouts, Java Logger class, What is logging in Java? In Java, Logging is an API that provides the ability to trace out the errors of the applications. When an application generates the logging call, the Logger records the event in the LogRecord. After that, it sends to the corresponding handlers or appenders. Before sending it to the console or file, the appenders format that log record by using the formatter or layouts. Need for Logging It provides the complete tracing information of the application. It records the critical failure if any occur in
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