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Recent questions tagged core-java

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asked john Guru 27.1k points 31 50 97
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asked john Guru 27.1k points 31 50 97
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asked sara Guru 24.6k points 29 52 81
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How do I convert a numeric IP address like 66.29.36.130 into a hostname like www.javacertificate.net?
asked john Guru 27.1k points 31 50 97
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asked john Guru 27.1k points 31 50 97
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asked john Guru 27.1k points 31 50 97
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How would you check if a String was a number before parsing it?
asked john Guru 27.1k points 31 50 97
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i am new to the java can you please tell me how can we find the stack trace in java,is there any method present in java for finding stacktrace.
asked sara Guru 24.6k points 29 52 81
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1 answer 40 views
what is the use of object in java?
asked keem Expert 13.2k points 27 40 59
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what is the use of class in java
asked sara Guru 24.6k points 29 52 81
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I have recently got doubt about the difference between the two ways of defining an array: int[] array int array[] Is there a difference? I haven't found anything in my Java book please explain this.
asked john Guru 27.1k points 31 50 97
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what is the use of this operator in java
asked sara Guru 24.6k points 29 52 81
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asked john Guru 27.1k points 31 50 97
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1 answer 25 views
I'd like to assign a set of variables in java as follows: int n1,n2,n3; for(int i=1;i<4;i++) { n<i> = 5; } How can I achieve this in Java?
asked keem Expert 13.2k points 27 40 59
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1 answer 28 views
In terms of Java, when someone asks: what is polymorphism? Would overloading or overriding be an acceptable answer? I think there is a bit more to it than that. IF you had a abstract base class that defined a method with no implementation, and you defined that method in the sub class, is that still overridding?
asked john Guru 27.1k points 31 50 97
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Is there some easy way to pad Strings in Java? Seems like something that should be in some StringUtil-like API, but I can't find anything that does this.
asked john Guru 27.1k points 31 50 97
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2 answers 8 views
What is reflection, and why is it useful? I'm particularly interested in Java, but I assume the principles are the same in any language!
asked john Guru 27.1k points 31 50 97
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1 answer 29 views
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I've been looking for a simple java algorithm to generate a pseudo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything ... to specify a length depending on my uniqueness needs. For example, a generated string of length 12 might look something like "AEYGF7K0DM1X"
asked john Guru 27.1k points 31 50 97
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