求问几个java面试题答案 谢了

1》 public static boolean isOdd(int n) {
return ((n%2)!=0) ? true : false;
}

2》写的不够好，欢迎指正

String a = "AABBBCDwEFdGHIiiiiiJK";
List list = new ArrayList();
Map maps = new HashMap();
for(int i=0;i String str = String.valueOf(a.charAt(i));
if(i>0){
String old = list.get(list.size()-1);
if(old.equals(str)){
if(!maps.containsKey(old)){
maps.put(old, 2);
}else{
Integer num = (Integer) maps.get(old);
maps.put(old, num+1);
}

}
}
list.add(str);
}

for(Map.Entry en:maps.entrySet()){
System.out.println(en.getKey() + "==" + en.getValue());
}

3》php：

echo strrev("Hello World!");
?>

4》：
SELECT AVG(sal) AS v FROM emp WHERE deptno=10 AND job = '工程师'

UPDATE emp SET job = '经理' AND sal=sal+1000 WHERE NAME='JONES'

SELECT job FROM emp WHERE deptno = 10 GROUP BY job

DELETE FROM emp WHERE id = 100512

5》：
java计划任务吧。

public static bolean isOdd(int n) { return n%2==1} 理由，查看是否是基数偶数