A. getPath B. length C. lastModified D. getLength
現(xiàn)有: - f 是一個(gè)對(duì) java.io.File 實(shí)例的合法引用 - fw 是一個(gè)對(duì) java.io.FileWriter 實(shí)例的合法引用 - bw 是一個(gè)對(duì) java.io.BufferedWriter 實(shí)例的合法引用 以下哪一項(xiàng)無(wú)效?()
A. PrintWriter prtWtr = new PrintWriter(f); B. PrintWriter prtWtr = new PrintWriter(fw); C. PrintWriter prtWtr = new PrintWriter(bw); D. BufferWriter bufWtr = new BufferedWriter(f); E. BufferWriter bufWtr = new BufferedWriter(fw); F. BufferWriter bufWtr = new BufferedWriter(bw);
class TestMain { static int x = 2; static { x = 4; } public static void main(String... args) { int y = x + 1; System.out.println(y); } } 和命令行: java TestMain 結(jié)果為:()
A. 3 B. 5 C. 編譯失敗 D. 運(yùn)行時(shí)異常被拋出