现有: -f是一个对java .io.File实例的合法引用 - fw足‘个对java.io.FileWriter实例的合法引用 - bw足一个对java.io.BufferedWriter实例的合法引用 以下哪一项无效?()
- APrintWriter prtWtr = new PrintWriter (f);
- BPrintWriter prtWtr = new PrintWriter( fw);
- CPrintWriter prtWtr = new PrintWriter(bw):
- DBufferWriter bufWtr = new BufferedWritr(f);
- EBufferWriter bufWtr = new BufferedWriter(fw);
- FBufferWriter bufWtr = new BufferedWriter (bw):