Concatenation of Strings and characters

Question

The following statements,

String string = \"string\";   

string = string +((char)65) + 5;
System.out.println(string);

Produce the output <

Answer 1

Case 1

string = string +((char)65) + 5;

everything is treated as String but in second case

Sequence of operation performed:

• string +((char)65 = stringA
• stringA + 5 = stringA5

Case 2

 string += ((char)65) + 5;

first right hand side is calculated means first operation will be like ((char)65) + 5, So result of ((char)65) + 5 is 70 and after that += operation.

Sequence of operation performed:

• (char)65 + 5 = 70
• string + 70 = string70

Lets see 1 more example

String string = "string";
string += ((char)65) + 5 + "A";
System.out.println(string); 

Output string70A

Reason Same first right hand side is calculated and sequesce of opertion performed is

• (char)65 + 5 = 70
• 70 + "A" = 70A
• string + 70A = string70A