Sample code to retrieve objects from HashMap in sorted ascending order?

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In a my eclipse editor if i want to switch from jdk 1.4 to jdk 1.6 how to do that???? Initially i have jdk1.4

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What is the return type of readLine() when end of a file is reached?

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Is the milky way in a void?

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Can we serialize arraylist in java?

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what is the swingutilities.invokelater(runnable) method for? : Java thread

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What is java’s garbage collected heap?

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FOR EXAMPLE WE R HAVING TWO LIST ELEMENTS ..BOTH LISTS CONTAINS ID,NAME,PLACE ..I NEED TO COMPARE BOTH IDS IN TWO LISTS,IF ID'S R SAME MEANS WE HAVE ADD THE DETAILS(LIKE NAME,PLACE) TO MAP...HOW IS POSSIBLE ?CAN ANY ONE SUGGEST?

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Integer.parse Int(bf.readLine(System.out.println("enter value for n["+m+"]:"))); can it run under this

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Who found java?

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What do you mean by thread safe?

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How many bytes is a character?

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