libj is a cross-platform native runtime library equipped with Java/JavaScript-like API and enables you to write efficient C++ code in a similar way to Java/JavaScript.

You need to clone all the dependant submodules to build libj.

git clone --recursive https://github.com/plenluno/libj.git

mkdir libj/build
cd libj/build
cmake ..
make

The memory management of libj is automatic, based on either shared_ptr or bdw-gc.
libj uses shared_ptr by default. In order to use bdw-gc,

cmake -DLIBJ_USE_BDWGC=ON ..

The following option allows you to use thread-related classes and concurrent collection classes.

cmake -DLIBJ_USE_THREAD=ON ..

tools/windows-cmake.ps1 [cmake-option ...]

export ANDROID_NDK=/path/to/android-ndk
tools/android-cmake.sh [cmake-option ...]

tools/ios-cmake.sh [cmake-option ...]