Update java-basic-questions-02.md 补全对使用不同方法创建String类型对象时的描述 #2753
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原文中只对使用字符串字面量创建`String`类型对象的方法进行描述,本次Commit加上对例子中使用`new`关键字创建`String`类型对象的方法的描述。