黑马程序员------毕老师视频笔记第13-17天------JavaAPI（String类、StringBuffer类）(2)

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String示例

class StringDemo{public static void main (String [] args){String str1 = "abcdefg";sop("\n***************查询示例**************************\n");sop("原字符串str1："+str1+"\n");sop("str1.length()："+str1.length()+"\n");sop("str1.charAt(2)："+str1.charAt(2)+"\n");//sop(str1.charAt(7));//抛出StringIndexOutOfBoundsException异常sop("str1.indexOf('c')："+str1.indexOf('c')+"\n");sop("str1.lastIndexOf('c')："+str1.lastIndexOf('c')+"\n");sop("str1.indexOf(\"bc\")："+str1.indexOf("bc")+"\n");sop("str1.lastIndexOf(\"bc\")："+str1.lastIndexOf("bc")+"\n");sop("str1.indexOf('k')："+str1.indexOf('k')+"\n");sop("str1.substring(2,5)："+str1.substring(2,5)+"\n");//含头不含尾String str2 = "abcd";String str3 = "Abcd";sop("\n***************判断示例**************************\n");sop("原字符串str2："+str2+"\n");sop("原字符串str3："+str3+"\n");sop("str2.equals(str3)："+str2.equals(str3)+"\n");sop("str2.equalsIgnoreCase(str3)："+str2.equalsIgnoreCase(str3)+"\n");sop("str2.contains(\"bc\")："+str2.contains("bc")+"\n");sop("str2.startsWith(\"ab\")："+str2.startsWith("ab")+"\n");sop("str2.endsWith(\"ab\")："+str2.endsWith("ab")+"\n");sop("str2.isEmpty()："+str2.isEmpty()+"\n");String str4 = "abc-tyu-jk";String str5 = "  asdf  ";char[] ch = {'a','f','g','t','r'};sop("\n***************转换示例**************************\n");sop("原字符串str4："+str4+"\n");sop("原字符串str5："+str5+"\n");sop("原字符数组：ch");sop(ch);sop();sop("str4.split(\"-\")：");sop(str4.split("-"));sop();sop("str4.toCharArray()：");sop(str4.toCharArray());sop();sop("str2.getBytes()：");sop(str2.getBytes());sop();sop("new String(ch)："+new String(ch)+"\n");sop("new String(ch,1,4)："+new String(ch,1,4)+"\n");sop("String.valueOf(ch)："+String.valueOf(ch)+"\n");sop("String.valueOf(ch,1,4)："+String.valueOf(ch,1,4)+"\n");sop("str3.toUpperCase()："+str3.toUpperCase()+"\n");sop("str3.toLowerCase()："+str3.toLowerCase()+"\n");sop("str4.replace('-','*')："+str4.replace('-','*')+"\n");sop("str4.replace(\"abc\",\"lll\")："+str4.replace('-','*')+"\n");sop("str5.trim()："+str5.trim()+"\n");sop("str4.concat(str5)："+str4.concat(str5)+"\n");sop("\n***************比较示例**************************\n");sop("str4.compareTo(str5)"+str4.compareTo(str5)+"\n");}public static void sop(){System.out.println();}public static void sop(String str){System.out.print(str);}public static void sop(String[] str){for(int i=0; i<str.length; i++){System.out.print(str[i]+" ");}}public static void sop(char[] ch){for(int i=0; i<ch.length; i++){System.out.print(ch[i]+" ");}}public static void sop(byte[] b){for(int i=0; i<b.length; i++){System.out.print(b[i]+" ");}}}

StringBuffer示例：

class StringBufferDemo{public static void main(String[] str){StringBuffer sb = new StringBuffer("123");sop("\n***************添加示例**************************\n");sop("原StringBuffer sb = new StringBuffer(\"123\")："+sb+"\n");sb.append("asdf");sop("sb.append(\"asdf\")："+sb+"\n");sb.append("-zcxvb");sop("sb.append(\"-zcxvb\")："+sb+"\n");sb.insert(5,"@@@@@");sop("sb.insert(5,\"@@@@@\")："+sb+"\n");sop("\n***************删除示例**************************\n");sb.delete(3,7);sop("sb.delete(3,7)："+sb+"\n");sb.deleteCharAt(4);sop("sb.deleteCharAt(4)："+sb+"\n");sop("\n***************查找示例**************************\n");sop("sb.charAt(3)："+sb.charAt(3)+"\n");sop("sb.indexOf(\"xv\")："+sb.indexOf("xv")+"\n");sop("sb.lastIndexOf(\"xv\")："+sb.lastIndexOf("xv")+"\n");sop("\n***************修改示例**************************\n");sb.replace(5,8,"00");sop("sb.replace(5,8,\"00\")："+sb+"\n");sb.setCharAt(2,'A');sop("sb.setCharAt(2,'A')："+sb+"\n");sop("\n***************翻转示例**************************\n");sb.reverse();sop("sb.reverse："+sb+"\n");sop("\n***************转化示例**************************\n");char[] ch = new char[5];sop("ch:");sop(ch);sop();sb.getChars(3,6,ch,0);sop("sop(sb.getChars(3,6,ch,0))之后ch：");sop(ch);sop();}public static void sop(){System.out.println();}public static void sop(String str){System.out.print(str);}public static void sop(char[] ch){for(int i=0; i<ch.length; i++){System.out.print(ch[i]+" ");}}}

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