import java.util.*; // for Arrays class public class ReferenceMystery2 { public static void main(String[] args) { int x = 1; = new int[2]; int[] a mystery(x, a); System.out.println(x + + Arrays.toString(a)); X--; a[1] mystery(x, a); System.out.println(x + } a.length; + Arrays.toString(a)); %3D %3D public static void mystery(int x, int[] list) { list[x]++; X++; + Arrays.toString(list)); System.out.println(x + } } line 1 line 2 line 3 line 4
import java.util.*; // for Arrays class public class ReferenceMystery2 { public static void main(String[] args) { int x = 1; = new int[2]; int[] a mystery(x, a); System.out.println(x + + Arrays.toString(a)); X--; a[1] mystery(x, a); System.out.println(x + } a.length; + Arrays.toString(a)); %3D %3D public static void mystery(int x, int[] list) { list[x]++; X++; + Arrays.toString(list)); System.out.println(x + } } line 1 line 2 line 3 line 4
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
Related questions
Question
JAVA language
![```java
import java.util.*; // for Arrays class
public class ReferenceMystery2 {
public static void main(String[] args) {
int x = 1;
int[] a = new int[2];
mystery(x, a);
System.out.println(x + " " + Arrays.toString(a));
x--;
a[1] = a.length;
mystery(x, a);
System.out.println(x + " " + Arrays.toString(a));
}
public static void mystery(int x, int[] list) {
list[x]++;
x++;
System.out.println(x + " " + Arrays.toString(list));
}
}
```
### Explanation:
In this Java program, we have a class named `ReferenceMystery2` which contains two methods: the `main` method and a helper method named `mystery`.
1. **`main` Method:**
- Initializes an integer `x` with a value of 1.
- Declares an integer array `a` of size 2 (`int[] a = new int[2]`) which means it contains two elements initially set to 0.
- Calls the `mystery` method with the current value of `x` and the array `a`.
- Prints the current value of `x` and the contents of the array `a` using `Arrays.toString(a)`.
- Decrements `x`.
- Sets the second element (`a[1]`) of the array `a` to the length of the array, which is 2.
- Calls the `mystery` method again with the updated values.
- Prints the final value of `x` and the contents of the array `a`.
2. **`mystery` Method:**
- Accepts an integer `x` and an integer array `list`.
- Increments the value at the index `x` of the array.
- Increments `x`.
- Prints the modified value of `x` and the array `list`.
The boxes labeled "line 1", "line 2", "line 3", and "line 4" seem to be placeholders and are not part of the Java code.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F0e691e7d-3aa6-4d87-8ff6-0afc8b27fff3%2F5406544c-e3be-4730-902f-a0d3d7e907fc%2Fbfgpyud_processed.jpeg&w=3840&q=75)
Transcribed Image Text:```java
import java.util.*; // for Arrays class
public class ReferenceMystery2 {
public static void main(String[] args) {
int x = 1;
int[] a = new int[2];
mystery(x, a);
System.out.println(x + " " + Arrays.toString(a));
x--;
a[1] = a.length;
mystery(x, a);
System.out.println(x + " " + Arrays.toString(a));
}
public static void mystery(int x, int[] list) {
list[x]++;
x++;
System.out.println(x + " " + Arrays.toString(list));
}
}
```
### Explanation:
In this Java program, we have a class named `ReferenceMystery2` which contains two methods: the `main` method and a helper method named `mystery`.
1. **`main` Method:**
- Initializes an integer `x` with a value of 1.
- Declares an integer array `a` of size 2 (`int[] a = new int[2]`) which means it contains two elements initially set to 0.
- Calls the `mystery` method with the current value of `x` and the array `a`.
- Prints the current value of `x` and the contents of the array `a` using `Arrays.toString(a)`.
- Decrements `x`.
- Sets the second element (`a[1]`) of the array `a` to the length of the array, which is 2.
- Calls the `mystery` method again with the updated values.
- Prints the final value of `x` and the contents of the array `a`.
2. **`mystery` Method:**
- Accepts an integer `x` and an integer array `list`.
- Increments the value at the index `x` of the array.
- Increments `x`.
- Prints the modified value of `x` and the array `list`.
The boxes labeled "line 1", "line 2", "line 3", and "line 4" seem to be placeholders and are not part of the Java code.
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