Programming Practice: if Statements and Boolean Conditions

SimpleMug class

Constructor

Recall the SimpleMug class constructor (given below). Modify the constructor so that it handles "bad" parameter values.

public SimpleMug(int maxCapacity, String liquidKind) {
    this.MAX_CAPACITY = maxCapacity;
    this.currAmount = 0;
    this.liquidKind = liquidKind;
    SimpleMug.mugCounter++;
}

fill method

Recall the original fill method:

public void fill(int amount) {
    int newCurrAmount = currAmount + amount;
    currAmount = newCurrAmount;
}

Rewrite the fill method so that it handles overflow: the current amount in the mug should not be allowed to exceed the maximum capacity of the mug and the amount of overflow should be returned.

public int fill(int amount) {

Rectangle class

Suppose we have a Rectangle class that begins:

class Rectangle {

    private Point upperLeft;		// the upper left corner point
    private double height;			// the height of the rectangle
    private double width;			// the width of the rectangle

isSquare method

Write an isSquare method that returns true if the rectangle is a square (and false otherwise).

contains method

Write a contains method that returns true if the point passed in is inside the rectangle

public boolean contains(Point p) {

Procrastination

An unnamed CS 302 student uses the following (not recommended) rubric to determine whether to procrastinate on a particular assignment:

• if there are fewer than 2 days remaining until the assignment is due, don't procrastinate
• if there are more than 5 days remaining until the assignment is due, procrastinate
• otherwise, if the temperature is above 70 degrees or if the temperature is above 55 degrees and it isn't raining, then procrastinate

Suppose that the following variables have been declared and given values:

• days - a double indicating the number of days until the assignment is due
• temp - a double indicating the temperature
• isRaining - a boolean indicating whether it is raining

Write Java code that sets a boolean variable procrastinate to true if the student should decide to procrastinate and false otherwise.

Method 1: use multiple, nested if-elses

Method 2: use only one if-else

Method 3: use no ifs