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GavinRay97/Makefile

Created December 8, 2022 21:21
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  1. GavinRay97 created this gist Dec 8, 2022.
    45 changes: 45 additions & 0 deletions Makefile
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    # Makefile to compile and run Java sources manually
    # because JDK 20 Valhalla support is not yet available in IntelliJ IDEA
    JAVA_VERSION = 20
    JAVAC = /home/user/downloads/jdk-20-vahalla-20-75/bin/javac
    JAVA = /home/user/downloads/jdk-20-vahalla-20-75/bin/java

    JAVA_COMPILE_OPTIONS = --enable-preview --release $(JAVA_VERSION)
    JAVA_OPTIONS = --enable-preview

    JAVA_MAIN_CLASS = org.example.Database
    JAVA_SOURCES = $(wildcard src/main/java/**/**/*.java)
    JAVA_CLASSES = $(patsubst src/main/java/%.java, target/classes/%.class, $(JAVA_SOURCES))

    # Compile the Java source files
    compile: $(JAVA_CLASSES)
    $(info Java source files: $(JAVA_SOURCES))
    $(info Java class files: $(JAVA_CLASSES))

    # Run the Java main class
    run: compile
    $(JAVA) $(JAVA_OPTIONS) -cp target/classes $(JAVA_MAIN_CLASS)

    # Clean the target directory
    clean:
    rm -rf target

    # Compile the Java source files
    target/classes/%.class: src/main/java/%.java
    $(JAVAC) $(JAVA_COMPILE_OPTIONS) -d target/classes $<

    # Create the target directory
    target/classes:
    mkdir -p target/classes

    # Make the target directory a dependency of the Java class files
    $(JAVA_CLASSES): target/classes

    # Make the target directory a dependency of the compile target
    compile: target/classes
    # Ditto...
    clean: target/classes
    run: target/classes
    default: target/classes

    default: run
    6 changes: 6 additions & 0 deletions example-output.txt
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    [user@MSI java-jdk20-valhalla]$ make run
    Java source files: src/main/java/org/example/Database.java src/main/java/org/example/PageLocation.java
    Java class files: target/classes/org/example/Database.class target/classes/org/example/PageLocation.class
    /home/user/downloads/jdk-20-vahalla-20-75/bin/java --enable-preview -cp target/classes org.example.Database
    Hello World!
    Page Location: PageLocation[databaseId=1, pageId=2]
    13 changes: 13 additions & 0 deletions source-files.java
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    // ./src/main/java/org/example/Database.java
    package org.example;
    class Database {
    public static void main(String[] args) {
    var examplePageLocation = new PageLocation(1, 2);
    System.out.println("Hello World!");
    System.out.println("Page Location: " + examplePageLocation);
    }
    }

    // ./src/main/java/org/example/PageLocations.java
    package org.example;
    public value record PageLocation(int databaseId, int pageId) {}