数组，list，map简单总结

package com.spring.springLearn;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Test {

private Test(){}
private static final Test ss = new Test();
public static Test getInst(){
return ss;
}

public static void main(String[] args) {
String[] a = new String[]{
"aaa","bbb","ccc"
};
String[] b = {"aaa","bbb","ccc"};
Test[] c = new Test[2];
c[0]=new Test();
c[1]=new Test();
for(int i=0;i<c.length;i++){
System.out.println(c[i]);
}

Map<String,String> map = new HashMap<String,String>();
map.put("a","aa");
map.put("b","aa");
map.put("c","aa");
map.put("d","aa");
System.out.println(map.size());
for(String key:map.keySet()){
System.out.println(map.get(key));
}
for(Map.Entry<String, String> m:map.entrySet()){
System.out.println(m.getValue());
}

List<String> list = new ArrayList<String>();
list.add("bb");
System.out.println(list.size());

}
}