为 java 1.6 切换类型字符串 [英] switch for type string for java 1.6

问题描述

我有以下代码，我想知道是否有办法使用 switch 块而不是一堆 if/else 语句.我知道 Java 从 Java 1.7 开始支持 switch 块中的字符串，但我仍在使用 Java 1.6:

I have the following code and I'm wondering if there is a way to use a switch block instead of a bunch of if/else statements. I know that Java supports strings in switch blocks as of Java 1.7 but I'm still working with Java 1.6:

} else if (typeName.equals("Boolean")) {

            return new SwitchInputType<Boolean>(new Boolean((String) memberValue));

        } else if (typeName.equals("Double")) {

            return new SwitchInputType<Double>(new Double((String) memberValue));

        } else if (typeName.equals("Int32"))

推荐答案

你甚至可以让 enum 为你做:

You could even make the enum do it for you:

public static void main(String[] args) throws InterruptedException {
    String typeName = "Boolean";
    String memberValue = "memberValue";
    SwitchInputType type = Type.valueOf(typeName).makeType(memberValue);
}

enum Type {
    Boolean {
        SwitchInputType makeType(String memberValue) {
            return new SwitchInputType<Boolean>(new Boolean(memberValue));
        }
    },
    Double {
        SwitchInputType makeType(String memberValue) {
            return new SwitchInputType<Double>(new Double(memberValue));
        }
    }, 
    Int32 {
        SwitchInputType makeType(String memberValue) {
            return new SwitchInputType<Integer>(new Integer(memberValue));
        }
    };

    // All must do this.
    abstract SwitchInputType makeType(String memberValue);
}

static class SwitchInputType<T> {
    public SwitchInputType(Object o) {
    }
}

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