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What is hashmap and map?
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Explain try and catch keywords in java?
What is loop in java?
What is the association?
How to provide security in java
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Can an interface extend a class?
Why java is a platform independent? Explain
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Will set allow duplicates in java?
What are the allowed, non-Unicode letter characters that can be used as the first character of an identifier?
What is a class reference?
Draw a UML class diagram for the code fragment given below: public class StringApplet extends Applet { private Label sampleString; private Button showTheString; private ButtonHandler bHandler; private FlowLayout layout; public StringApplet() { sampleString = new Label(" "); showTheString = new Button (" Show the String"); bHandler = new ButtonHandler(); layout = new FlowLayout(); showTheString.addActionListener(bHandler); setLayout(layout); add(sampleString); add(showTheString); } class ButtonHandler implements ActionListener { public void actionPerformed(ActionEvent e) { samplestring.setText("Good Morning"); } } } Note: The methods need not be indicated on the diagram.
What is System class and its purpose?
Core Java 
