programme:-some important method you can used in string
1) s2=s1.toUpperCase; converts the string s1 to all uppercase.
2) s2=s1.toLowerCase; converts the string s1 to all lowercase;
3) s2=s1.replace('x' , 'y'); Replace all appearances of x with y
4) s1.equals(s2) Returns 'true' if s1 is equal to s2
5) s1.length() Gives the length of s1
6) s1.compareTo(s2) Returns negative if s1<s2, positive if s1>s2, and zero if s1 is equal s2
1) s2=s1.toUpperCase; converts the string s1 to all uppercase.
2) s2=s1.toLowerCase; converts the string s1 to all lowercase;
3) s2=s1.replace('x' , 'y'); Replace all appearances of x with y
4) s1.equals(s2) Returns 'true' if s1 is equal to s2
5) s1.length() Gives the length of s1
6) s1.compareTo(s2) Returns negative if s1<s2, positive if s1>s2, and zero if s1 is equal s2
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