String user="张三,1234 13673738888";String[] strs = user.split(",| ");//用“逗号”或“空格”进行分割

public class TestString {public static void main(String[]args) {String str = "吃葡萄不吐葡萄皮，不吃葡萄倒吐葡萄皮"; //请统计葡萄 出现的次数// String str = "葡萄不吐葡萄皮，不吃葡萄倒吐葡萄"; //请统计葡萄 出现的次数// 第一种String str1 = str.replace("葡萄", " ");int index = str.indexOf("葡萄", 4);char[]data = str1.toCharArray();int count = 0;for (char a: data) {if (a == ' ') {count++;}}System.out.println(count);//第二种/*int count = 0;int x = 0;while (x != -1) {x = str.indexOf("葡萄");if (x != -1) {count++;str = str.replaceFirst("葡萄", "");}}System.out.println(count);*///第三种/* for (int x = 0; x < str.length(); x++) {if (str.contains("葡萄")) {str = str.replaceFirst("葡萄", "");} else {System.out.println(x);break;}}*///第四种/*String str1 = "葡萄不吐葡萄皮，不吃葡萄倒吐葡萄"; //请统计葡萄 出现的次数String[]data = str1.split("葡萄");if (!str1.endsWith("葡萄")) {//这里startsWith("葡萄")在split时，会在开头产生空串System.out.println(data.length - 1);} else {System.out.println(data.length);}*///第五种/*int count = 0;int x = 0;while (x != -1) {x = str.indexOf("葡萄");if (x != -1) {if ((x + 2) < str.length()) {str = str.substring(x + 2);}count++;}}System.out.println(count);*///第六种/* String str2 = str.replace("葡萄", "");int length = str2.length();System.out.println((str.length() - str2.length()) / 2);*/}}

public class StringDemo {public static void main(String[] args) {String s="123456789中国";System.out.println(s.length()); //11System.out.println(s.getBytes().length);//GBK下是13, UTF-8下是15
        System.out.println(hasChinese(s));s="12中国asd湖12南6城市学院";print(s);}private static void print(String s) {char[] ch=s.toCharArray();for(char c:ch){if((c+"").getBytes().length>1){//汉字的字节数大于1System.out.println("中文字符："+c);}else if(c>='a'&&c<='z' || c>='A'&& c<='Z'){System.out.println("英文字符："+c);}else if(c>='0'&&c<='9'){System.out.println("数字："+c);}}}private static boolean hasChinese(String s) {if(s.getBytes().length>s.length()){//只有含有汉字时，字符转换的字节长度才会大于字符串长度return true;}return false;}
}

public class StringDemo2 {public static void main(String[] args) {//1、字符串比较大小String s1="H234567中国";String s2="Hello Java";System.out.println("1、"+s1.compareTo(s2));// 返回两个字符串之差(第一个不同字符的差,即‘2’与‘e’的差：   -51)//2、字符串位置查找String s3="adc256sadf";String s4="c2";System.out.println("2、"+s3.indexOf(s4));//2//3、查找姓名中带“飞”字的人，查找姓“张”的人。String[] names= { "张三", "张无忌", "赵敏", "张飞", "岳飞", "飞龙张" };System.out.print("3、带“飞”的人：");for(String name:names){if(name.indexOf("飞")>=0){System.out.print(name+"  ");}}System.out.println();System.out.print("  姓“张”的人：");for(String name:names){if(name.indexOf("张")==0){System.out.print(name+"  ");}}System.out.println();// 4、查找扩展名为“.java”的文件名。String[] filenames = { "aa.java", "cc.doc", "34.bat", "33.java.c","java.exe", "c:\\a\\a.java" };String ss=".java";System.out.print("4、扩展名为.java文件名：");for(String name:filenames){if(name.endsWith(ss)){System.out.print(name+"  ");}}System.out.println();//5、substring()String c ="abcd".substring(2,3);//  相当于数学中的：[2,3)System.out.println("5、“abcd”.substring(2,3)= "+c);//6、split()String user="张三,1234,13673738888";String strs[] = user.split(",");System.out.print("6、");for(String s:strs){System.out.print(s+"  ");}System.out.println();user="张三,1234 13673738888";strs = user.split(",| ");//7、用“逗号”或“空格”进行分割System.out.print("7、");for(String s:strs){System.out.print(s+"  ");}System.out.println();user="aa.bb.cc,dd,ee fff";strs = user.split("\\.|,| ");//8、“.”号是特殊字符，因此要用转义字符，而且要加两个//strs = user.split("[.]|,| ");//“[]”也是转义字符System.out.print("8、");for(String s:strs){System.out.print(s+"  ");}System.out.println();String us ="张三|1234|13673738888";//strs = us.split("\\|");//9、“|”不能用这种转义的方式分割，这种情况下可先采用字符替换us=us.replace("|", ",");//replace()返回的是一个新的字符串strs = us.split(",");System.out.print("9、");for(String s:strs){System.out.print(s+"  ");}}
}