Assignment

Assignment expressions assign data to a variable.

Data comes from the right side of the = operator and goes to the left.

int x;
x = 12;

Assignment also evaluates to a value. This is why we can have multiple assignment statements in a row.

int x;
x = 12;
int y = x = 9; //x and y both have value 9

The value 9 is assigned to x, and the result of that evaluation is assigned to y.

Drill

Expressions/src/drills/Assignment.java * In main, uncomment the call to the method intAssignment(). Run the following code.

  int x = 12;
  System.out.println("x is " + x);
  System.out.println(x = 99);
  System.out.println("x is now " + x);

* Notice how x is assigned inside the System.out.println() statement and its value is printed to the screen. This is because assignment results in a value. * Now comment the call to intAssignment() and uncomment booleanAssignment() Run the following code.

  boolean value = false;
  System.out.println("value is " + value);
  System.out.println(value = true);
  System.out.println("value is now " + value);

The result of the boolean assignment was a true value.

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