4, the various operation of the string

 Packagecom.xxx.xxx;Importjava.util.Date; Public classDemo5 {/*** String Connection *@paramargs*/     Public Static voidMain (string[] args) {//String Connection        intA = 33; floatb = 44.5f; //when a string is concatenated with an shaping, floating-point variable, the toString () method is automatically called, and the connection is joined after it is converted to a stringSystem.out.println ("I Spend" +a+ "hours a day reading," +b+ "Hours of computer practice"); //gets the string length str.length ()String S1 = "Hello"; intSize =s1.length (); System.out.println ("Length is:" +size); //string Lookup starting from 0 indexOf (string s);        intA1 = S1.indexof ("o"); System.out.println ("Character O first occurrence position:" +A1); intA2 = S1.lastindexof ("e"); System.out.println ("Character E last seen position:" +A2); //Gets the character Str.charat () of the specified index;String str = "Hello word!"; CharMyChar = Str.charat (6); System.out.println ("The character in the string str with index position 6 is:" +MyChar); //1.1 get substring substring (int brgindex)String substr = str.substring (3); System.out.println ("1.1 Get substring:" +substr); //1.2 get substring substring (int brgindex,endindex)String substrend = str.substring (0, 3); System.out.println ("1.2 Get substring:" +substrend); //Remove Spaces Str.trim () leading and trailing spacesString str1 = "Good bye! "; String Strtrim=Str1.trim (); System.out.println ("Source string Length:" +str1.length () + "---" +str1+ "length after removing spaces:" +strtrim.length () + "----" +Strtrim); //string Substitution str.replace (char Oldchar,cahr Newchar) converts the specified string to a new stringString str2 = "adress"; String newstring= Str2.replace ("A", "good"); System.out.println ("Source string:" +str2+ "new string:" +newstring); //to determine the start and end of a string the return value is a Boolean str.startswith (string prefix) endwith (string suffix)String STR3 = "ABCDEFG"; BooleanBool1 = Str3.startswith ("a"); BooleanBool2 = Str3.endswith ("G"); System.out.println (Bool1+"  "+bool2); //determines whether strings are equal str.equals (string other) case-sensitive str.equalsnorecase ( string Other)String SS1 =NewString ("ABC"); String SS2=NewString ("ABc"); System.out.println (equals case-sensitive string comparison 1: "+ss1.equals" ("ABC")); System.out.println ("Equals case-sensitive string comparison 2:" +ss1.equals (SS2)); System.out.println ("Case-Insensitive string comparison 2:" +ss1.equalsignorecase (SS2)); //compare two strings in dictionary order Str.compareto (string other)System.out.println (Ss1.compareto ("Def"))); //Letter Case conversion (numbers and non-characters not affected) Convert lowercase s3.tolowercase () convert uppercase S3.touppercase ()String s3 = "ABc"; System.out.println ("Original:" +s3+ "converted to lowercase" +s3.tolowercase ()); System.out.println ("Original:" +s3+ "converted to uppercase" +s3.touppercase ()); //string Split split ( string sign)String S4 =NewString ("Abc,deg,ghi,gki"); String s5arr[]= S4.split (",");//no split number set                 for(String Aa1:s5arr) {System.out.println ("" No set number of splits "before the split:" +s4+ "after the split string:" +Aa1); } String s6arr[]= S4.split (",", 2);//set Number of times is 2         for(String Aa2:s6arr) {System.out.println ("" Set the number of splits 2 times before the split: "+s4+" after the split string: "+AA2); }                //formatted string format ()%te%th%tl Baidu commonly used date format conversion characterDate Date =NewDate (); String Time= String.Format ("%TC", date); String form= String.Format ("%TF", date); String s_date= String.Format ("%te", date); System.out.println ("Formatted string:" +s_date); System.out.println ("All the Time information:" +Time ); System.out.println ("Year-month-day format:" +form); //Format () (There is also a general type of formatting%b%d%e ... )String a10 = String.Format ("%d", 400/2);//decimalString A11 = String.Format ("%b", 400/2);//Boolean typeString A12 = String.Format ("%x", 400/2);//Hexadecimal typeSystem.out.println ("400/2 Decimal type format:" +a10+ "Boolean Type type format:" +a11+ "hexadecimal type format:" +A12); }}

4, the various operation of the string