Example - 1

The condition for the second if statement is impossible to satisfy. It requires that the variables be non-null, while on the only path where s can be assigned a non-null value there is a return statement.

s = "Yes";return;
Dead();String s = null;if (b) {}if (s != null) {}

Example - 2

In the following class, two private methods call each other, but since neither one is ever invoked from anywhere else, they are both dead code.

doTweedledumb();
doTweedledee();
System.out.println("running DoubleDead");private void doTweedledee() {}private void doTweedledumb() {}public static void main(String[] args) {}public class DoubleDead {}

(In this case it is a good thing that the methods are dead: invoking either one would cause an infinite loop.)

Example - 3

The field named glue is not used in the following class. The author of the class has accidentally put quotes around the field name, transforming it into a string constant.

return "glue";String glue;public String getGlue() {}public class Dead {}