1z0-819 — Free Practice Questions
10 free sample questions from a bank of 237, with the correct answers and explanations. No signup required — start practising right now.
1Given: What is the result?
- 2-4
- 0-6 1-5 2-4
- 1-5
- 1-5 2-4
- The compilation fails due to an error in line 1.
- 0-6
- 0-6 2-4
Answer: C
2Given TripleThis.java: Compiling TripleThis.java gives this compiler warning:
Note: TripleThis.java uses unchecked or unsafe operations.
Which two replacements remove this compiler warning and prints 12? (Choose two.)
- Replace line 12 with public static void printValue(Function f, int num) {
- Replace line 12 with public static void printValue(Function f, T num) {
- Replace line 9 with Function tripler = x —> { return (Integer) x * 3; }
- Replace line 12 with public static void printValue(Function f, Integer num) {
- Replace line 9 with Function tripler = x -> { return x * 3; }
- Replace line 9 with Function tripler = x -> [ return x * 3; ]
Answer: A, D
3Given the code fragment: What change on line 1 will make this code compile?
- Add catch(M | L e)
- Add catch(L e)
- Add catch(N | L | M e)
- Add catch(L | N e)
- Add catch(L | M | N e)
Answer: B
4Given the code fragment: Which two code snippets inserted independently inside println method print Mondial:domainmodel? (Choose two.)
- Main.prefix + Main.name
- prefix + getName
- Main.prefix + Main.getName()
- new Main().prefix + new Main().name
- prefix + name
- prefix + Main.name
Answer: C, D
5Given the code fragment: What is the result?
- [Lettuce, Kale]
- A compilation error is thrown.
- [Lettuce, Kale] [Seabass, Salmon]
- [Kale, Lettuce] [Salmon, Seabass]
Answer: C
6Given:
Automobile.java - Car.java - What must you do so that the code prints 4?
- Remove the parameter from wheels method in line 3.
- Remove abstract keyword in line 1.
- Replace the code in line 2 with Car ob = new Car();.
- Add @Override annotation at line 2.
Answer: A
7Which module is required for any application using Swing or AWT?
- java.desktop
- java.prefs
- java.se
- java.logging
- java.rmi
Answer: A
8Which set of commands is necessary to create and run a custom runtime image from Java source files?
- java,jdeps
- javac,jlink
- javac,jar
- jar,jlink
Answer: B
9Given the code fragment: Which would cause s to be AQCD?
- s.replace(s.indexOf("B"), s.indexOf("B"), "Q");
- s.replace(s.indexOf("A"), s.indexOf("B"), "Q");
- s.replace(s.indexOf("B"), s.indexOf("C"), "Q");
- s.replace(s.indexOf("A"), s.indexOf("C"), "Q");
Answer: C
10Given: Which two methods facilitate valid ways to read instance fields? (Choose two.)
- getCCount
- getTCount
- getACount
- getGCount
- getTotalCount
Answer: B, C
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