关于一个大map和多个小map的性能对比

话不多说，看结果  10万条数据，两种方法基本上差不多

单位毫秒
录入时间为：2226
查找时间为：22
-----
录入时间为432
查找时间为：13

import java.util.*;

public class MapTest2 {

public static void main(String ags[]) {
test2();
System.out.println("-----");
test1();
}

public static void test1() {
Map m = new HashMap(100000);
long t0 = System.currentTimeMillis();
for (int i = 0; i < 100000; i++) {
m.put("aa.bb.to.pub." + i + "12345asfsdfVO", "value");
}
long t1 = System.currentTimeMillis();
System.out.println(t1 - t0);

//随机取出1000个数字
for (int i = 0; i < 10000; i++) {
int j = new Random(10000).nextInt();
m.get("aa.bb.to.pub." + j + "12345asfsdfVO");
}
long t2 = System.currentTimeMillis();
System.out.println(t2 - t1);

}

public static void test2() {
Map m = new HashMap(10);
m.put("aa.bb.ao", new HashMap(10000));
m.put("aa.bb.bo", new HashMap(10000));
m.put("aa.bb.co", new HashMap(10000));
m.put("aa.bb.do", new HashMap(10000));
m.put("aa.bb.eo", new HashMap(10000));
m.put("aa.bb.fo", new HashMap(10000));
m.put("aa.bb.go", new HashMap(10000));
m.put("aa.bb.ho", new HashMap(10000));
m.put("aa.bb.io", new HashMap(10000));
m.put("aa.bb.jo", new HashMap(10000));
long t0 = System.currentTimeMillis();
for (int i = 0; i < 10; i++) {

for (int j = 0; j < 10000; j++){
// 每个模块里有1000个
((Map) m.get("aa.bb.ao")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.bo")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.co")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.do")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.eo")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.fo")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.go")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.ho")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.io")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
((Map) m.get("aa.bb.jo")).put("aa.bb.to.pub." + j+ "12345asfsdfVO", "value");
}
}
long t1 = System.currentTimeMillis();
System.out.println("录入时间为：" + (t1 - t0));;
// System.out.println(m.get("8888key"));
for (int i = 1; i < 10000; i++) {
int j = new Random(10000).nextInt();
((Map) m.get("aa.bb.ao")).get("aa.bb.to.pub." + j+ "12345asfsdfVO");
}
long t2 = System.currentTimeMillis();
System.out.println("查找时间为：" + (t2 - t1));

}


}