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String Concept

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public static void main(String[] args) {      boolean stmt1 = "champ" == "champ";      boolean stmt2 = new String("champ").equals(new String("champ"));       boolean stmt3 = "champ".toString()=="champ";     System.out.println(stmt1 && stmt2 && stmt3);  } The output is true
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String and StringBuffer!

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Select the common methods, which are defined for both type String and type StringBuffer ?         Please choose all the answers that apply:   toString()   length()  append(String)  trim()  equals(Object)   Put your doubts in the comment section. 
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