Java Methods

== Halving Method =======================================
half(2); // calling method

public void half(int input) {
    input = input / 2; // output would be 1
}
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== Doubling Method ======================================
doub(2); // calling method

public void doub(int input) {
    input = input * 2; // output would be 4
}
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== Parity Method ========================================
parity(2); // calling method

public boolean parity(int input) {
    return (input % 2 == 0) ? 1 : 0; // returns 1 if even, returns 0 if odd
}
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== Sorting Method =======================================
sort(asc, test_list); // calling method

public void sort(String SORTBY, ArrayList ARRAYLIST) {
    switch (SORTBY.toLowerCase()) {
        case "asc": // sort by ascending order
            Collections.sort(ARRAYLIST);
            break;
        case "desc": // sort by descending order
            Collections.sort(ARRAYLIST, Collections.reverseOrder());
            break;
        default:
            break;
    }
}
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== System Information Methods ===========================
getOS(); // calling getOS Method
getOSVersion(); // calling getOSVersion Method
getCores(); // calling getCores Method
getFreeMem(); // calling getFreeMem Method
getMaxMem(); // calling getMaxMem Method
getTotalMem(); // calling getTotalMem Method

public String getOS() {
    return System.getProperty("os.name"); // returns the OS name
}

public double getOSVersion() {
    return System.getProperty("os.version"); // returns the OS version
}

public String getArch() {
    return System.getProperty("os.arch"); // returns the OS architecture
}

public int getCores() {
    return Runtime.getRuntime().availableProcessors(); // returns available core count
}

public long getFreeMem() {
    return Runtime.getRuntime().freeMemory(); // returns free memory
}

public long getMaxMem() {
    return Runtime.getRuntime().maxMemory(); // returns max memory
}

public long getTotalMem() {
    return Runtime.getRuntime().totalMemory(); // returns total system memory
}
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