设计模式课程 设计模式精讲 7-3 建造者模式源码解析（jdk+guava+

 public StringBuilder append(boolean b) {
        super.append(b);
        return this;
    }

    public StringBuilder append(char c) {
        super.append(c);
        return this;
    }

    public StringBuilder append(int i) {
        super.append(i);
        return this;
    }

    public StringBuilder append(long lng) {
        super.append(lng);
        return this;
    }

    public StringBuilder append(float f) {
        super.append(f);
        return this;
    }

    public StringBuilder append(double d) {
        super.append(d);
        return this;
    }

    public synchronized StringBuffer append(Object obj) { super.append(String.valueOf(obj)); return this; } public synchronized StringBuffer append(String str) { super.append(str); return this; }