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Java > Learn Java > Hi, Can anyone help me on below queries? 1. What makes...
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Hi, Can anyone help me on below queries? 1. What makes a class as "Thread safe class" ? 2. equals() method uses 3. Difference between String vs StringBuffer ?

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Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

There are three ways to construct thread-safe Java class which has some state: 1. Make it truly immutable 2.Make field volatile. 3.Use a synchronized block
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Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

equals() method compares string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object. public boolean equals(Object anObject)
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Java/J2EE, B.E./B.Tech/MCA SubjectsTraining

String vs StringBuffer : 1) Mutability: String is immutable (Once created, cannot be modified) while StringBuffer is mutable (can be modified). 2) Performance: While performing concatenations you should prefer StringBuffer over String because it is faster. The reason is: When you concatenate strings...
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String vs StringBuffer : 1) Mutability: String is immutable (Once created, cannot be modified) while StringBuffer is mutable (can be modified). 2) Performance: While performing concatenations you should prefer StringBuffer over String because it is faster. The reason is: When you concatenate strings using String, you are actually creating new object every time since String is immutable. read less
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String objects are immutable in java while in StringBuffer objects u can make changes like insert ,delete or append characters
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String objects are immutable in java while in StringBuffer objects u can make changes like insert ,delete or append characters
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1.Defining the threading model for your application is probably the most important step you can take into making your code thread safe.You need to have your threading model down beforehand so you can actually get your code right. The reason for that is that there are a lot of different ways to make your...
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1.Defining the threading model for your application is probably the most important step you can take into making your code thread safe.You need to have your threading model down beforehand so you can actually get your code right. The reason for that is that there are a lot of different ways to make your class thread safe, and you can only pick the right one if you know the thread access pattern to your class. 2.This method compares 'this' string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this object. 3.------------------------------------------------------------------------------- String StringBuffer ---------------------------------------------------------------------------------- Storage Area Constant String Pool Heap Modifiable No (immutable) Yes( mutable ) Thread Safe Yes Yes Performance Fast Very slow ----------------------------------------------------------------------------------- read less
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Core Java Advanced Java NET GATE Computer Science

equals method is in Object class whose default implementation checks the memory location of the objects which is similar to ===. The String class has overridden the equals method and new implementation checks the string content present in the object. One has to override the hashcode(in Object class)...
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equals method is in Object class whose default implementation checks the memory location of the objects which is similar to ===. The String class has overridden the equals method and new implementation checks the string content present in the object. One has to override the hashcode(in Object class) method too when override the equals method. read less
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Experienced IT Trainer/Coach, Founder Win Corporate Training, Counsellor

String class is used create the immutable strings in Java. For Example: String str=new String("Good"); - If I want to add the word "Morning" I have to recreate my String class Object. String str=new String("Good Monring"); StringBuffer is used to create the Mutable Strings in Java StringBuffer...
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String class is used create the immutable strings in Java. For Example: String str=new String("Good"); - If I want to add the word "Morning" I have to recreate my String class Object. String str=new String("Good Monring"); StringBuffer is used to create the Mutable Strings in Java StringBuffer str1=new StringBuffer("Good"); str1.append("Monring"); We can add the new word without creating the object of the String class. read less
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1. What makes a class as "Thread safe class"? Thread safe class: If your class is being accessed by multiple threads then there is a possibility that class variable/properties may be accessed or changed by two or more thread simultaneously which may result in inconsistent behaviour of class. The process...
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1. What makes a class as "Thread safe class"? Thread safe class: If your class is being accessed by multiple threads then there is a possibility that class variable/properties may be accessed or changed by two or more thread simultaneously which may result in inconsistent behaviour of class. The process of preventing this is called as Thread safe. Process to make class thread safe: Use Synchronized Methods/blocks to prevent access of class properties by multiple threads. Use of Volatile keyword so that properties changed by one thread will immediately reflect to all other places. 2. equals() method uses equals method is used in Java to equate different Objects of Class. 3. Difference between String vs StringBuffer? String is immutable while StringBuffer is mutable. Mutable means state of object can be changed, while state of immutable can not be altered. read less
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StringBuffer outdated , use StringBuilder thread safe,
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