java--CharAt,StartWith
发布时间:2020-12-15 08:24:56 所属栏目:Java 来源:网络整理
导读:public class CharAtStartWithDemo { public static void main(String[] args){ //jdk8 testCharAt();//1 testStartWith();//4 } public static void testCharAt(){ StringBuffer sb = new StringBuffer(); for (int i = 0; i 1000; i++) { sb.append(i); if
public class CharAtStartWithDemo { public static void main(String[] args){ //jdk8 testCharAt();//1 testStartWith();//4 } public static void testCharAt(){ StringBuffer sb = new StringBuffer(); for (int i = 0; i < 1000; i++) { sb.append(i); if (i < 999){ sb.append(","); } } String s = sb.toString(); int length = s.length(); long begin = System.currentTimeMillis(); for (int i = 0; i < 10000; i++) { if (s.charAt(0)=='a'&&s.charAt(1)=='b'&&s.charAt(2)=='c'){} if (s.charAt(length-1)=='a'&&s.charAt(length-2)=='b'&&s.charAt(length-3)=='c'){} } long end = System.currentTimeMillis(); System.out.println(end-begin); } public static void testStartWith(){ StringBuffer sb = new StringBuffer(); for (int i = 0; i < 1000; i++) { sb.append(i); if (i < 999){ sb.append(","); } } String s = sb.toString(); int length = s.length(); long begin = System.currentTimeMillis(); for (int i = 0; i < 10000; i++) { if (s.startsWith("abc")){} if (s.endsWith("abc")){} } long end = System.currentTimeMillis(); System.out.println(end-begin); } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |