单项选择题
	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");
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                                    单项选择题
                                    
Which code, inserted at line 14, sets the value of b to 314.159,26?()
A.b=nf.parse(input);
B.b=nf.format(input);
C.b=nf.equals(input);
D.b=nf.parseObject(input); - 
                                    单项选择题
                                    
Given a vaid DateFormat object named df, and What updates d’s value with the date represented by ds?()
A.18.d=df.parse(ds);
B.18.d=df.getDate(ds);
C.18.try{19.d=df.parse(ds);20. }catch(ParseException e){ }
D.18.try{19.d=df.getDate(ds);20. }catch(ParseException e){ } - 
                                    多项选择题
                                    
Giventhatcisareferencetoavalidjava.io.Consoleobject,whichtwocodefragmentsreadalineoftextfromtheconsole?()
A.String s = c.readLine();
B.char[ ] c = c.readLine();
C.String s = c.readConsole();
D.char[ ] c = c.readConsole();
E.String s = c.readLine("%s", "name ");
F.char[ ] c = c.readLine("%s", "name ");