Don’t assign static references to instance method calls in Java

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Assigning a static reference to an instance method call could be perilous. Let’s take a look at an example Java class to examine why:

/**
 * Foo.java
 */

public class Foo {
    public static String foo = Config.getInstance().getFoo();
}

Seems pretty innocuous in itself, but ostensibly we’re just assigning static reference in Foo…