绑定反射的JDK 8快速构造字符串的方法，并给出相关代码片段。

基于MethodHandles.Lookup和LambdaMetafactory绑定反射的JDK 8快速构造字符串的方法，通过反射机制访问非公开的String(char[] value, boolean share)构造函数，从而避免不必要的数组拷贝。以下是相关代码片段：

public static BiFunction<char[], Boolean, String> getStringCreatorJDK8() throws Throwable { 
Constructor<MethodHandles.Lookup> constructor = MethodHandles.Lookup.class.getDeclaredConstructor(Class.class, int.class); 
constructor.setAccessible(true); 
MethodHandles.Lookup lookup = constructor.newInstance(String.class, -1); // Lookup.TRUSTED 
MethodHandles.Lookup caller = lookup.in(String.class); 

MethodHandle handle = caller.findConstructor(String.class, MethodType.methodType(void.class, char[].class, boolean.class)); 

CallSite callSite = LambdaMetafactory.metafactory( 
caller, 
"apply", 
MethodType.methodType(BiFunction.class), 
handle.type().generic(), 
handle, 
handle.type() 
); 

return (BiFunction<char[], Boolean, String>) callSite.getTarget().invokeExact(); 
}