String类型转换

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练习代码

<span style="font-size:14px;">/** * String字符串 * @author admin * */public class StringEx {public static void main(String[] args) {String str = "abc";//将数组转换为字符串char[] cs = {'a','b','c'};String s = new String(cs);System.out.println(s);//将字符串转换为数组char[] charArray = str.toCharArray();for (int i = 0; i < charArray.length; i++) {System.out.print(charArray[i]+",");}char c = str.charAt(1);System.out.println(c);int codePointAt = str.codePointAt(1);int codePointBefore = str.codePointBefore(1);sop(codePointAt);sop(codePointBefore);String s2 = "happy";sop(str.concat(s2));        sop(str+s2);                //开发常用拼接sop(s2.contains("p"));        //判断是否包含sop(s2.contentEquals("app"));          /*char[] cha = {'e','a'};sop(s2.copyValueOf(cha));*/String javas = "dadda.java";sop(javas.endsWith(".java"));       //判断文件类型String q = "hua";String w = "HUA";sop(q.equals(w));sop(q.equalsIgnoreCase(w));          //验证码，不区分大小写byte[] byt = q.getBytes();for (int i = 0; i < byt.length; i++) {System.out.print(byt[i]+"--");}}//打印对象public static void sop(Object obj){System.out.println(obj);}}</span>

StringBuffer

<span style="font-size:14px;">/** * stringbuffer实例 * @author admin * */public class StringExchange {public static void main(String[] args) {StringBuffer buffer2 = new StringBuffer();System.out.println(buffer2.capacity());        //自定义长度buffer2.append("你好，新世界");StringBuffer buffer = new StringBuffer();char[] ch = {'h','a','o'};buffer.append("nihao").append("shijie");buffer.append(ch);buffer.append(23);buffer.append(buffer2);buffer.appendCodePoint(56);System.out.println(buffer.toString());System.out.println(buffer.capacity());     //字符长度System.out.println(buffer.charAt(5));      //脚标点System.out.println(buffer.codePointCount(2, 8));   //字符串长度System.out.println(buffer.delete(3, 8));System.out.println(buffer.deleteCharAt(3));  //指定字符删除System.out.println(buffer.insert(1, "中"));    //指定添加System.out.println(buffer.offsetByCodePoints(4, 8));System.out.println(buffer.replace(2, 4, "夏目玲子"));  //替代字符串}}</span>

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