Programming - String Buffers

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19.

StringBuffer sb=new StringBuffer("New Delhi"); String s=sb.substring(4); In the above,from where to where the substring is formed.                        
A. only 4th position string B. from 4th to till end
C. from first to last D. none



20.

String substring(int I,int j).this extract the sub string from?                        
A. int I to j B. from 0 to int j
C. from I to j-1 D. from i-1 to j



21.

The String which gives same string even after reversing is _____________                        
A. palindrome B. polinomial
C. both D. none




22.

Is StringBuilder class can be changed or not mutable?                        
A. yes B. no
C. Cant say D. none



23.

To lock the object the method is _________________                        
A. synchronizing B. StringBuilder
C. serializing D. none



24.

Is StringBuilder can be synchronized or not?                        
A. yes B. no
C. Cant say D. none



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