java单选题.doc

? 。 。 。 。,判断在编译时哪行将出错?     1)lassTest{     2)   intm,n;     3)   publicTest(){}     4)   publicTest(inta){m=a;}     5)   publicstaticvoidmain(Stringarg[]){     6)      Testt1,t2;     7)      intj,k;     8)      j=0;k=0;     9)      t1=newTest();     10)     t2=newTest(j,k);     11)   }     12)}    ,以下描述哪一个正确?classBase{}classSubextendsBase{}classSub2extendsBase{}lassTest{     publicstaticvoidmain(Stringargs[]){           Baseb=newBase();           Subs=(Sub)b;     }} 。 ,运行时出错。 ,但可以继续运行。 。? ;lassTest{...} .*;packagetestpackage;lassTest{...} .*;classPerson{...}lassTest{...} .*;.*;lassTest{...},选择正确的运行结果classTest{     publicstaticvoidmain(Stringargs[]){           AClassref1=newAClass(5);           AClassref2=newAClass(10);           (ref2);     }}classAClass{     privateintx;     AClass(intx){           =x;     }     voidgetAddShow(AClassref){           (+"""");     }} 。 。 ,结果为5。 ,结果为10。,运行结果为多少?classParent{     Stringone,two;     publicParent(Stringa,Stringb){           one=a;           two=b;     }     publicvoidprint(){(one);}}classChildextendsParent{     hild(Stringa,Stringb){            super(a,b);     }     publicvoidprint(){           (one+""to""+two);     }     publicstaticvoidmain(Stringarg[]){           Parentp=newParent(""south"",""north"");                     Parentt=newChild(""east"",""west"");           ();           ();     }}    ,哪段程序返回false?     Strings="hello";     Stringt="hello";     charc[]={´h´,´e´,´l´,´l´,´o´}; (t); (c); ==t; ==c; ?     StringBuffe