String类使用的例子(1)
2024-07-21 02:20:14
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using system;
class mystring {
public string str;
public mystring (char[] strvalue) {
str = new string(strvalue);
console.writeline("the string '" + str + "' has been initialised by passing an array of characters");
}
public mystring (char strvalue,int intcount) {
str = new string(strvalue,intcount);
console.writeline("the string '" + str + "' has been initialised by a character '" + strvalue + "' which is repeated '" + intcount + "' times");
}
public mystring (char[] strvalue,int intstart,int intend) {
str = new string(strvalue,intstart,intend);
console.writeline("the string "+ str + " has been initialised by array of characters starting from '"+intstart+"' and ending at '"+intend+"'");
}
}
public class clsstring {
char[] charray; //={'c','h','a','r','a','c','t','e','r',' ','a','r','r','a','y'};
int intchoice;
mystring objstring;
public static void main() {
clsstring obj = new clsstring();
obj.init();
}
private void init() {
console.writeline("1. create the string through character array");
console.writeline("2. create the string through a single character which is repeated a number of times");
console.writeline("3. create the string through character array specifying the starting and ending places");
console.writeline("4. to exit");
console.write("enter your choice : " );
string strtemp=console.readline();
intchoice=int.parse(strtemp);
try {
switch (intchoice) {
case 1:
mtdcharacterarray();
break;
case 2:
mtdrepetions();
break;
case 3:
mtdcharraystend();
break;
default:
console.writeline("default");
environment.exit(0);
break;
}
mtdmethods();
init();
}
catch (exception e) {
console.writeline("error occured at :" + e.stacktrace);
}
}
private void mtdcharacterarray() {
charray=mtdgetcharray();
objstring = new mystring(charray);
}
private char[] mtdgetcharray() {
char[] chtemparray = new char[char.maxvalue];
string strtemp;
console.write("enter the character(s) : ");
strtemp=console.readline();
chtemparray=strtemp.tochararray();
return chtemparray;
}
private void mtdrepetions() {
console.write("give the number of repetions : ");
string strtmp=console.readline();
int inttemp=int.parse(strtmp);
charray=mtdgetcharray();
objstring = new mystring(charray[0],inttemp);
}
private void mtdcharraystend() {
string strtmp;
console.write("give the starting position :");
strtmp=console.readline();
int intstart=int.parse(strtmp);
console.write("give the ending position : ");
strtmp=console.readline();
int intend=int.parse(strtmp);
charray=mtdgetcharray();
objstring = new mystring(charray,intstart,intend);
}
private void mtdmethods() {
console.writeline("");
console.writeline("1. concatenate strings ");
console.writeline("2. copy of a string into an existing one.");
console.writeline("3. create a new string out of the charecters in the original one");
console.writeline("4. check if the string ends with a particular set of characters");
console.writeline("5. formating the string");
console.writeline("6. hash code of the string");
console.writeline("7. index of first occurence of any string within another string");
console.writeline("8. index of first occurence of any character in the given string");
console.writeline("9. insert a string at a specified place");
console.writeline("10. join the strings with a seperator");
console.writeline("11. index of last occurence of any string within another string");
console.writeline("12. index of last occurence of any character in the given string");
console.writeline("13. length of the string");
console.writeline("14. pad required number of spaces or any other character to the left of the string");
console.writeline("15. pad required number of spaces or any other character to the right of the string");
console.writeline("16. remove some characters from a specified location");
console.writeline("17. replaces all occurences of a specified string in another string");
console.writeline("18. split the string depending on a delimiter");
console.writeline("19. check if the string starts with a particular 'string'");
console.writeline("20. retrieve a substring");
console.writeline("21. get the string in lower case");
console.writeline("22. get the string in upper case");
console.writeline("23. trim the string");
console.writeline("24. trim the end of the string");
console.writeline("25. trim the start of the string");
console.writeline("26. exit the program");
console.writeline("");
console.write("what do u want to do now : " );
string strmtd=console.readline();
console.writeline("");
try {
int intswitch=int.parse(strmtd);
switch (intswitch) {
case 1:
mtdconcatenate();
break;
case 2:
mtdcopy();
break;
case 3:
mtdcopyto();
break;
case 4:
mtdendswith();
break;
case 5:
mtdformat();
break;
case 6:
mtdhash();
break;
case 7:
mtdindexof();
break;
case 8:
mtdindexofany();
break;
case 9:
mtdinsert();
break;
case 10:
mtdjoin();
break;
case 11:
mtdlastindex();
break;
case 12:
mtdlastindexany();
break;
case 13:
mtdlength();
break;
case 14:
mtdpadleft();
break;
case 15:
mtdpadright();
break;
case 16:
mtdremove();
break;
case 17:
mtdreplace();
break;
case 18:
mtdsplit();
break;
case 19:
mtdstartswith();
break;
case 20:
mtdsubstr();
break;
case 21:
mtdlower();
break;
case 22:
mtdupper();
break;
case 23:
mtdtrim();
break;
case 24:
mtdtrimend();
break;
case 25:
mtdtrimstart();
break;
case 26:
environment.exit(0);
break;
default:
console.writeline("wake up !!!! . select a correct choice");
break;
}
mtdmethods();
}
catch (exception e){
console.writeline("error : " + e.message);
console.writeline("source: " + e.stacktrace);
environment.exit(0);
}
}
private void mtdconcatenate() {
string[] strtemparr=new string[10];
console.writeline("string.concat() - > this concatenates strings together.there are 4 implementations");
console.writeline("1. string.concat(string[]) -> concatenates the string array");
console.writeline("2. string.concat(string,string) -> concatenates the two strings");
console.writeline("3. string.concat(string,string,string) -> concatenates the three strings ");
console.writeline("4. string.concat(string,string,string,string) -> concatenates the four strings ");
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