To determine which of the statements are valid, let's go through each option:

A. A System.out.println(1+1); This statement is valid because it uses the System.out.println() method to print the result of the expression 1+1, which is 2.

B. B int i=2+'2'; This statement is not valid. In Java, when you use single quotes ('') around a character, it represents a single character. In this case, '2' is not a valid character. If you want to concatenate the integer value 2 with the string "2", you should use double quotes ("") instead of single quotes.

C. C String s="on"+'one'; This statement is not valid. Similar to the previous option, the use of single quotes around 'one' is not valid. If you want to concatenate the string "on" with the string "one", you should use double quotes for both strings.

D. D byte b=255; This statement is not valid. In Java, the range of values that can be assigned to a byte is from -128 to 127. The value 255 is outside this range.

Based on the explanations above, the valid statements are A and B. Therefore, the correct answer is A, B.

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) All of the variables in an interface are implicitly static - This option is true. In an interface, all variables are implicitly static, meaning they belong to the interface itself rather than any specific instance.

Option B) All of the variables in an interface are implicitly final - This option is true. In an interface, all variables are implicitly final, meaning their values cannot be changed once they are assigned.

Option C) All of the methods in an interface are implicitly abstract - This option is true. In an interface, all methods are implicitly abstract, meaning they do not have a body and must be implemented by any class that implements the interface.

Option D) A method in an interface can access class-level variables - This option is false. Methods in an interface can only access variables declared within the interface itself. They cannot access variables from implementing classes or any other classes.

The correct answer is A, B, C. These options are correct because variables in an interface are implicitly static and final, and methods in an interface are implicitly abstract.

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• Wrong explanation

To answer this question, let's go through each option and analyze the code snippet provided:

Option A) The code will compile and print "Equal". In the given code snippet, the trim() method is used to remove leading and trailing whitespace from the string " String ". The trim() method returns a new string with the whitespace removed.

However, when comparing strings, the == operator checks for reference equality, not value equality. In Java, the == operator compares the memory addresses of the objects being compared.

In this case, the string " String " is not the same object as the string "String", even though they have the same value after trimming. Therefore, the == comparison will evaluate to false.

So, the code will not print "Equal".

Option B) The code will compile and print "Not Equal". As explained in Option A, the == comparison will evaluate to false because the strings being compared are different objects. Therefore, the code will print "Not Equal".

Option C) The code will cause a compiler error. There is no compilation error in the given code. The code is syntactically correct, and there are no issues that would cause a compiler error.

Option D) (No option provided) This is not a valid option.

The correct answer is A) The code will compile and print "Equal".

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• Wrong explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) test - This option is incorrect because the code on line 13 assigns a null value to the args array, and then on line 14, it tries to access args[0] and assign it the value "test". Since args is null, a NullPointerException is thrown before reaching the System.out.println statement.

Option B) Exception - This option is incorrect because the catch block on line 16 catches any exception of type Exception. However, the exception that is thrown in this case is a NullPointerException, so the catch block on line 16 is not executed.

Option C) Compilation fails - This option is correct because on line 14, the code tries to assign a value to args[0] without first initializing the args array. This will result in a compilation error because the args array is null and cannot be accessed.

Option D) NullPointerException - This option is incorrect because the catch block on line 19 catches a NullPointerException, but since the code fails to compile, this block is not executed.

The correct answer is C) Compilation fails. This option is correct because attempting to assign a value to an uninitialized array (args[0]) will result in a compilation error.

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• Wrong explanation

To answer this question, let's go through each option and analyze the code:

Option A) null - This option is incorrect because the code does not print "null" in this scenario.

Option B) zero - This option is incorrect because the code does not print "zero" in this scenario.

Option C) some - This option is incorrect because the code does not print "some" in this scenario.

Option D) Compilation fails - This option is correct. The code will fail to compile due to a syntax error on line 13. The line String str = "null'; has a syntax error because the closing double quote is missing. It should be String str = "null";.

Option E) An exception is thrown at runtime - This option is incorrect because the code does not throw an exception at runtime. The code fails to compile before it can be executed.

Therefore, the correct answer is D) Compilation fails.

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• Wrong explanation