I want to Learn java. How do I start?

Asked by A B 03/12/2014 Last Modified 07/10/2025

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What are the core concepts of Java?

OOPs, Flow control, String Handling, generics, exception, threading, collection, IO, JDBC are some core concepts of Java.

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What will be the output of the program? public class Test { public static int y; public static void foo(int x) { System.out.print("foo "); y=x; } public static int bar(int z) { System.out.print("bar "); return y=z; } public static void main(String [] args ) { int t=0; assert t > 0 : bar(7); assert t > 1 : foo(8); /* Line 18 */ System.out.println("done "); } } A. bar B. bar done C. foo done D. Compilation fails

Compiler error on line 18. You can't call method in assert with void return type.

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class HappyGarbage01 { public static void main(String args[]) { HappyGarbage01 h = new HappyGarbage01(); h.methodA(); /* Line 6 */ } Object methodA() { Object obj1 = new Object(); Object [] obj2 = new Object[1]; obj2[0] = obj1; obj1 = null; return obj2[0]; } } Where will be the most chance of the garbage collector being invoked? A. After line 9 B. After line 10 C. After line 11 D. Garbage collector never invoked in methodA()

Hello Shrikant who told you that you can explicity call garbage collector. You cann't call gc explicity even when you use System.gc() it is not guranteed that gc will be invoked it is all up to JVM when...

Srikanth

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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 .

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Why Java doesnot have Pointer ?

The reasons are Pointers are fundamentally unsafe. Java has a robust security model and disallows pointer arithmetic.Java ensures pointer access via indexed array. A big advantage of Java's indexed array...

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