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What are the topics in Java?

Asked by Shaun 10/07/2017 Last Modified 14/07/2017

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How can I execute a Java program?

Through command-line 1.compile the code using javac filename.java 2. Finally run the code using java filename here filename is classname. If u use eclipse then right click the java code n select run as java application .

Suresh

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Is synchronized keyword necessary, in Java, if everything that is modified in a function is local to that function?

No, it is not required if you make sure whatever parameters are updated/modified will be done as atomic references/operations. Atomicity is an alternative to syncronizatiom.

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Base obj=new Child(); What are the advantage and real life application of above code?

Have you ever observed while communicating with databases? You can find such type of example while writing code from communicating with DB. Connection connectionObject = DriverManager.getConnection(); or Statement...

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How do I learn Java? From book or internet or a coaching?

It is good to learn Java from Coaching where you will get more exposure in learning at faster pace.

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public void foo( boolean a, boolean b) { if( a ) { System.out.println("A"); /* Line 5 */ } else if(a && b) /* Line 7 */ { System.out.println( "A && B"); } else /* Line 11 */ { if ( !b ) { System.out.println( "notB") ; } else { System.out.println( "ELSE" ) ; } } } A. If a is true and b is true then the output is "A && B" B. If a is true and b is false then the output is "notB" C. If a is false and b is true then the output is "ELSE" D. If a is false and b is false then the output is "ELSE"

Srikanth

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