Applying the encapsulate field refactoring in A.f, it does not change the field assignment "f = 10" by setF(10) in the A constructor.

Before Refactoring:

public class A {
    private int f;    
    public A() {
        f = 10;
    }
    int m(int x) {
        return f;
    }
}

Resulting Program:

public class A {
    private int f;    
    public A() {
        f = 10;
    }
    int m(int x) {
        return getF();
    }

    /**
     * @return the f
     */
    public int getF() {
        return f;
    }

    /**
     * @param f the f to set
     */
    public void setF(int f) {
        this.f = f;
    }
}