随笔分类 -  Java

摘要：Stringa="Aa";Stringb="BB";System.out.println(a.hashCode());System.out.println(b.hashCode());Hashtable<String,String>map=newHashtable<String,String>();map.put(a,"test");map.put(a,"test");System.out.println(map.size());System.out.println(map.get(a)); 阅读全文

摘要：假如在D:\Java存放了两个java源文件：MyJava.java，Fighting.javaMyJava.java如下：public class MyJava {publicstatic void main(String[] arr){System.out.println("MyJava");}}Fighting.java如下：package mxw.ly;public class Fighting {publicstatic void main(String[] arr){System.out.println("学会使用java和javac命令") 阅读全文

摘要：import java.lang.*;import java.util.*;public class Test { public static void main(String[] str) { List arr = new ArrayList(10); List arr2 = new ArrayList(10); Why(new A()); Why(new B()); doTest(new ArrayList(123)); doTest(arr); doTest(arr2); ExecTest(arr); ExecTest(arr2); } static void Why... 阅读全文

摘要：第一个例子：import java.lang.*;public class Test { public static void main(String[] str) { Fun(new MyInterface(){public void Say() { System.out.println("this is temp interface"); }}); Fun(new People(){public void Say() { System.out.println("this is temp class"); }}); } static void Fun( 阅读全文