Given: public class ScopeTest { int j, int k; public static void main(String[] args) { ew ScopeTest().doStuff(); } void doStuff() { int x = 5; doStuff2(); System.out.println("x"); } void doStuff2()…

The correct answer is A. j B. k. Fields (also called instance variables) are variables declared directly inside a class body, outside of any method or block. j and k are declared at the class level in ScopeTest, so they belong to every instance of the class - that makes them fields. x (choice C) is declared…

Java Basics

Question

Given:
public class ScopeTest {
int j, int k;
public static void main(String[] args) {
ew ScopeTest().doStuff();
}
void doStuff() {
int x = 5;
doStuff2();
System.out.println("x");
}
void doStuff2() {
int y = 7;
System.out.println("y");
for (int z = 0; z < y; z++) {
System.out.println("z");
System.out.println("y");
}
}
}
Which two items are fields?

Options

How the community answered

(25 responses)

A
88% (22)
C
4% (1)
D
4% (1)
E
4% (1)

Explanation

Fields (also called instance variables) are variables declared directly inside a class body, outside of any method or block. j and k are declared at the class level in ScopeTest, so they belong to every instance of the class - that makes them fields.

x (choice C) is declared inside doStuff(), making it a local variable that only exists while that method is executing. y (choice D) is similarly local to doStuff2(). z (choice E) is even more restricted - it's declared in a for loop header, giving it block scope that disappears after the loop ends.

Memory tip: Think "class-level = field, method-level = local." If the variable lives inside curly braces that belong to a method, constructor, or block, it's local. If it lives inside the class's own curly braces with no method wrapping it, it's a field.

Topics

#variable scope#fields#instance variables#local variables

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