According to the Java Code Conventions as defined by Oracle, the parts of a class or interface declaration should appear in the following order in the source files:

• Class and instance variables
• Constructors
• Methods

Noncompliant Code Example

public class Foo {
  private int field = 0;
  isTrue() {...}
  public Foo() {...}                // Noncompliant, constructor defined after method
  public static final int OPEN = 4; // Noncompliant, variable defined after method
}

Compliant Solution

public class Foo{  // Compliant
  public static final int OPEN = 4;
  private int field = 0;
  public Foo() {...}
  public boolean isTrue() {...}
}