Java - Language Fundamentals Questions and Answers

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Java Language Fundamentals questions with answers are essential for mastering the building blocks of Java programming. This includes topics like data types, operators, arrays, and control structures. Practicing programming questions and answers with explanations enables students to improve coding accuracy and logical reasoning. These Java MCQs are widely asked in technical interviews and online coding assessments conducted by companies like Infosys, TCS, and Capgemini. Reviewing Java aptitude questions with solutions PDF helps solidify your understanding of syntax and execution flow for placement and certification exams.

Java - Language Fundamentals

Showing 10 of 14 questions

1. Which four options describe the correct default values for array elements of the types indicated? int -> 0     String -> "null"     Dog -> null     char -> '\u0000'     float -> 0.0f     boolean -> true

  • 1, 2, 3, 4
  • 1, 3, 4, 5
  • 2, 4, 5, 6
  • 3, 4, 5, 6
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2.  Which one of these lists contains only Java programming language keywords?

  • class, if, void, long, Int, continue
  • goto, instanceof, native, finally, default, throws
  • try, virtual, throw, final, volatile, transient
  • byte, break, assert, switch, include
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3. Which will legally declare, construct, and initialize an array?

  • int [] myList = {"1", "2", "3"};
  • int [] myList = (5, 8, 2);
  • int myList [] [] = {4,9,7,0};
  • int myList [] = {4, 3, 7};
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4. Which is a reserved word in the Java programming language?

  • method
  • native
  • subclasses
  • reference
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5. Which is a valid keyword in java?

  • interface
  • string
  • Float
  • unsigned
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6. Which three are legal array declarations?     int [] myScores [];     char [] myChars;     int [6] myScores;     Dog myDogs [];     Dog myDogs [7];

  • 1, 2, 4
  • 2, 4, 5
  • 2, 3, 4
  • All are correct.
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7. public interface Foo {     int k = 4; /* Line 3 */ } Which three piece of codes are equivalent to line 3?     final int k = 4;     public int k = 4;     static int k = 4;     abstract int k = 4;     volatile int k = 4;     protected int k = 4;

  • 1, 2 and 3
  • 2, 3 and 4
  • 3, 4 and 5
  • 4, 5 and 6
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8. Which one of the following will declare an array and initialize it with five numbers?

  • Array a = new Array(5);
  • int [] a = {23,22,21,20,19};
  • int a [] = new int[5];
  • int [5] array;
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9. Which three are valid declarations of a char?     char c1 = 064770;     char c2 = 'face';     char c3 = 0xbeef;     char c4 = \u0022;     char c5 = '\iface';     char c6 = '\uface';

  • 1, 2, 4
  • 1, 3, 6
  • 3, 5
  • 5 only
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10. Which is the valid declarations within an interface definition?

  • public double methoda();
  • public final double methoda();
  • static void methoda(double d1);
  • protected void methoda(double d1);
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