String Output

We have seen how the + sign between String variables or literals concatenates them.

concatenation¶

Joining strings end to end.
  System.out.println("snow" + "ball");
  //Output: snowball

Drill¶

screenoutputkeyboardinput/drills/StringOutput.java * Examine the code and add what you expect the output to be in each comment. * Then run the code.

The final example is tricky because of how Java uses the + operator. Here is another example.

String oddConcat = 3 + 4 + "56" + 3 + 4;
System.out.println(oddConcat);

This code outputs 75634.

The reason is that Java will add numbers around the + operator until it sees a String on one side of the +; then it will use the + operator for concatenation.

String Concatenation

Practice Exercise¶

You can force String concatenation by preceding a variable with an empty String, "". Note that this empty String is not a space character.

System.out.println("" + 4 + 2);
//Output: 42 instead of 6

Prev -- Up -- Next