摘要：class Book{ private String title ; private double price ; public Book(String title , double price ){ this.title = title ; this.price = price ; } publi... 阅读全文

摘要：class Teacher{ private String name; private Student student []; //多个学生用对象数组 public Teacher(String name) { this.name = name ; } public void setStudent(... 阅读全文

摘要：String： 两个字符床 String stra 和String strb stra = "hello " ; strb = "hello " 在对象池中开辟一块内存"hello " stra与strb都指向同一块地址。 字符串的不可改变性 在JavaAPI文档... 阅读全文