提取到类重构中

public class Foo {
    private String b;
    public String getInfo() {
        return ("(" + b + ")");
    }
...
}

public class Bar {
    Foo foo;
    String t2 = foo.getInfo();
...
}

public class Foo {
    private final Info info = new Info();
    public String getInfo() {
        return info.getInfo();
    }
...
}

public class Info {
    private String b;
    public Info() {}
    public String getInfo() {
        return ("(" + b + ")");
    }
}

public class Bar {
    Foo foo;
    String t2 = foo.getInfo();
...
}

class Account {
int gamma (int val1, ...) {
//some computations
return c-2*a;
}
}

class Account {
    int gamma (int val1, ...) {
        Calculations calculations = new Calculations(val1, ...).invoke();
        int c = calculations.getC();
        int a = calculations.getA();
        return c-2*a;
    }
    private class Calculations {
        private int val1;
        ...
        private int a;
        private int c;
        public Calculations(int val1, ...) {
            this.val1 = val1;
            ...
        }
        public int getA() {return a;}
        public int getC() {return c;}
        public Calculations invoke() {
            ...//computations
               return this;
        }
    }
}

public class A {
    private void drawEdge(Graphics g, float edgeWidth,
        int x1, int x2, int y1, int y2) {
        final Graphics2D g2d = (Graphics2D) g;
        g2d.setStroke(new BasicStroke(edgeWidth));
        g.drawLine(x1, y1, x2, y2);
    }
}

public class A {
    private void drawEdge(Edge edge, Graphics g) {
        final Graphics2D g2d = (Graphics2D) g;
        g2d.setStroke(new BasicStroke(edge.getEdgeWidth()));
        g.drawLine(edge.getX1(), edge.getY1(), edge.getX2(), edge.getY2());
    }
}

public class Edge {
    private final float edgeWidth;
    private final int x1;
    ...
    public Edge(float edgeWidth, int x1, int x2, int y1, int y2) {
        this.edgeWidth = edgeWidth;
        this.x1 = x1;
        ...
    }
    public float getEdgeWidth() {
        return edgeWidth;
    }
    public int getX1() {
        return x1;
    }
    ...
}