How to compare 2 string variables java interview questions interviewdot

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1. What would you use to compare two String variables - the operator == or the method equals()?I'd use the method equals() to compare the values of the Strings and the == to check if two variables point at the same instance of a String object. [i.e address in memory]

2. Why would you use a synchronized block vs. synchronized method ?Synchronized blocks place locks for shorter periods than synchronized methods.

3. How could Java classes direct program messages to the system console, but error messages, say to a file?The class System has a variable out that represents the standard output, and the variable err that represents the standard error device. By default, they both point at the system console. This how the standard output could be re-directed:Stream st = new Stream(new FileOutputStream("output.txt")); System.setErr(st); System.setOut(st);
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