同人类任何语言一样，Java为我们提供了一种表达思想的方式。如操作得当，同其他方式相比，随着问题

变得愈大和愈复杂，这种表达方式的方便性和灵活性会显露无遗。-With human beings, like any language, Java provides us with a way to express ideas. If operating properly, when compared with other methods, with the problem has become bigger and more complex, the expression of the convenience and flexibility will be shown.