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String concatenation

• + operator concatenates strings:
  "Hello, " + name
• If one argument of + is a string, the other is converted into a string:
  int n = 7;
String greeting = "Hello, " + n;
// yields "Hello, 7"

• toString method is applied to objects
  Date now = new Date();
String greeting = "Hello, " + now;
// concatenates now.toString()
// yields "Hello, Wed Jan 17 16:57:18 PST 2001"

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