Java uses the + and += operators to indicate concatenation for string values. : Assignment Operators « Operators « SCJP

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SCJP » Operators » Assignment Operators 
2.10.7.Java uses the + and += operators to indicate concatenation for string values.
Add the Unicode character for the Greek letter pi to the String

public class MainClass {
  public static void main(String[] argv) {
    float pi = 3.14159f;
    String tmp = "Pi = " + pi + " or " + '\u03c0';

    System.out.println(tmp);
  }
}
 
Pi = 3.14159 or ?
2.10.Assignment Operators
2.10.1.Assignment Operator Summary
2.10.2.Compound Assignment Operators
2.10.3.An arithmetic operator with = perform an operation on the variable on the left side and store the results in the variable.
2.10.4.a = b = c is evaluated as a = (b = c).
2.10.5.Simple assignment uses =
2.10.6.Assignment operators include an implicit cast.
2.10.7.Java uses the + and += operators to indicate concatenation for string values.
2.10.8.compound additive operator (+=) and Strings
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