Java Tuple2 使用访问器方法和直接调用变量的区别 [英] Java Tuple2 difference between using accessor method and calling the variable directly
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问题描述
我在 Java 代码中使用 Tuple2,我想知道通过 getter 访问值或直接获取变量是否有区别.
I'm using Tuple2 in my Java code, and I was wondering if there was a difference between accessing the values via the getter or just getting the variables directly.
Tuple2<String,String> tuple = new Tuple2<>("Hello", "World");
//getting values directly
String direct = tuple._1;
//using getter
String indirect = tuple._1();
推荐答案
第一个加载一个字段,其中第二个使用 getField
和 invokeVirtual
操作码相对地调用方法.生成的字节码看起来像
The first loads a field where the second invokes the method using getField
and invokeVirtual
opcodes relatively. The generated byte-code looks like
13: getfield #6 // Field scala/Tuple2._1:Ljava/lang/Object;
16: checkcast #7 // class java/lang/String
19: astore_2
20: aload_1
21: invokevirtual #8 // Method scala/Tuple2._1:()Ljava/lang/Object;
24: checkcast #7 // class java/lang/String
区别在于字段读取和方法调用之间的区别,即 JIT
编译器很乐意内联该方法,这对性能没有太大影响.
And the difference is the difference between a field read and a method invocation, ie the JIT
compiler is happy to inline the method and it wouldn't matter much performance wise.
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