带参数的匿名类初始化——《Thinking in Java》随笔020

//: Parcel8.java

package cn.skyfffire;

interface Destination {
    String readLabel();
}

public class Parcel8 {
    public static Destination dest(final String dest) {
        return new Destination() {
            String label = dest;
            
            @Override
            public String readLabel() {
                return label;
            }
        };
    }
    
    public static void main(String[] args) {
        System.out.println(Parcel8.dest("heiheihei").readLabel());
    }
}

///: ~

 也可以使用第二种方法：

//: Parcel9.java

package cn.skyfffire;

public class Parcel9 {
    interface Destination {
        String readLabel();
    }
    
    public Destination dest(final String dest, 
            final int price) {
        return new Destination() {
            private int cost;
            private String label;
            
            // 直接通过构造代码块进行初始化
            {
                label = dest;
                cost = price;
            }
            
            @Override
            public String readLabel() {
                return label + ":" + cost;
            }
        };
    }
}

///: ~