考虑以下代码片段:
public static Object o = new Object();
public static Callable x1() {
Object x = o;
return () -> x;
}
public static Callable x2() {
return () -> o;
}
方法x2()
将始终返回相同的lamba对象,而x1()
将始终创建新的对象:
System.out.println(x1());
System.out.println(x1());
System.out.println(x2());
System.out.println(x2());
将打印出类似下面这样的内容:
TestLambda$$Lambda$1/821270929@4a574795
TestLambda$$Lambda$1/821270929@f6f4d33
TestLambda$$Lambda$2/603742814@7adf9f5f
TestLambda$$Lambda$2/603742814@7adf9f5f
在哪里(我猜是在JVM规范中?)是否描述了lambda重用的规则?JVM如何决定在哪里重用?
https://stackoverflow.com/questions/29674645
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