Instance blocks, static blocks, constructor chaining using this() and super() .
int[] arr = 10, 20, 30; for(int num : arr) System.out.println(num);
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File reading and writing using FileInputStream , FileOutputStream , FileReader , and FileWriter .
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History, features of Java (Platform independence, robustness, security), and the differences between JDK, JRE, and JVM.
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: You can find his latest instructional content and conceptual explanations on the Durga Software Solutions channel, which often accompanies the written materials. Key Topics Covered in the Notes
Pay close attention to the interview tips highlighted in the margins of the notes. These often contain answers to tricky, real-world questions asked by top tech employers.