A.Error B.Exception C.Event D.Throwable
A.StringBuffer sb=“java”; B.inti=0x56; C.Boolean b=new Boolean(“java”); D.float f=1.0;
已知: 則在橫線處添加哪些代碼b的值為true()
A.s1==s B.s2==s C.s3==s D.s.equals(s1)