ParJava is extension of Java environment by facilities to support developing of effective scalable portable object-oriented parallel SPMD-programs for homogenous and heterogeneous computing systems with distributed memory. ParJava model is determined by four Java-interfaces, which support the notion of computing space as JavaVM network. ParJava allows to perform parallel programs designed for homogenous system on heterogeneous ones without lost of scalability. These facilities provide base supporting design of high-level object models of parallel programming.