Integer caching

App.java

public class App {
    public static void main(String[] args) {
        System.out.println("Demonstrating Integer Caching in Java");
        System.out.println("-------------------------------------\n");
        // Test lower bound (-128)
        Integer lowerBound1 = -128;
        Integer lowerBound2 = -128;
        System.out.println("Lower Bound (-128): " + (lowerBound1 == lowerBound2));

        // Test just below lower bound (-129)
        Integer justBelowLower1 = -129;
        Integer justBelowLower2 = -129;

        System.out.println("Just Below Lower (-129): " + (justBelowLower1 == justBelowLower2));
        Integer cachedInt1 = 100;
        Integer cachedInt2 = 100;
        System.out.println("Cache Range (100): " + (cachedInt1 == cachedInt2));

        // Test value at potential default upper bound (127)
        Integer upperBound1 = 127;
        Integer upperBound2 = 127;
        System.out.println("Upper Bound (127): " + (upperBound1 == upperBound2));

        // Test value just above potential default upper bound (128)
        Integer justAboveUpper1 = 128;
        Integer justAboveUpper2 = 128;
        System.out.println("Just Above Upper (128): " + (justAboveUpper1 == justAboveUpper2));


        // Test outside default cache range (initially, e.g., 200)
        Integer nonCachedInt1 = 200;
        Integer nonCachedInt2 = 200;
        System.out.println("No Cache (200): " + (nonCachedInt1 == nonCachedInt2));

    }
}

java_version.txt

java --version
openjdk 17.0.2 2022-01-18
OpenJDK Runtime Environment (build 17.0.2+8-86)
OpenJDK 64-Bit Server VM (build 17.0.2+8-86, mixed mode, sharing)

result_java_-XX:AutoBoxCacheMax=1000_App.txt

Demonstrating Integer Caching in Java
-------------------------------------

Lower Bound (-128): true
Just Below Lower (-129): false
Cache Range (100): true
Upper Bound (127): true
Just Above Upper (128): true
No Cache (200): true

result_java_App.txt

Demonstrating Integer Caching in Java
-------------------------------------

Lower Bound (-128): true
Just Below Lower (-129): false
Cache Range (100): true
Upper Bound (127): true
Just Above Upper (128): false
No Cache (200): false