问题:
Given:
Which code fragment, inserted at line 24, outputs "123abc 123abc"?()
A . sb1.append("abc"); s1.append("abc");
B . sb1.append("abc"); s1.concat("abc");
C . sb1.concat("abc"); s1.append("abc");
D . sb1.concat("abc"); s1.concat("abc");
E . sb1.append("abc"); s1 = s1.concat("abc");
F . sb1.concat("abc"); s1 = s1.concat("abc");
G . sb1.append("abc"); s1 = s1 + s1.concat("abc");
H . sb1.concat("abc"); s1 = s1 + s1.concat("abc")
Given:
Which code fragment, inserted at line 24, outputs "123abc 123abc"?()
● 参考解析
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