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``` public class HelloWorld { public static void main(String[] args){ //String str = "www.mldn.cn";// 直接赋值-String类对象实例化 String str = new String("www.b 阅读全文
posted @ 2023-06-06 14:24
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### demo1 实际项目中经常用到 综合本章很多知识点。 ``` class Member { private String mid ; private String name ; private Role roles [] ; public Member(String mid,String n 阅读全文
posted @ 2023-06-06 13:43
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``` class Member { private String mid; private String name; private Product products[]; public Member(String mid,String name){ this.mid = mid; this.na 阅读全文
posted @ 2023-06-06 10:45
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``` class Dept {// 部门类 private long deptno; private String dname; private String loc; private Emp emps[]; public Dept(long deptno,String dname,String 阅读全文
posted @ 2023-06-06 10:08
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