单项选择题
A.X=6
B.X=5
C.X=2
D.编译失败
单项选择题 以下哪种初始化数组的方式是错误的?()
单项选择题 现有: class Output { public static void main (String[] args) { int i=5: System.out.print( "4"+i+""); System.out.print (i+5+"7"); System.out.println (i+"8"); } } 结果为:()
单项选择题 现有: public class Tester { public static void main (String[] args) { intx-5; Integer xl=x; Integer x2=x; int x3=new Integer(5); system..ut.print(x1.equals(x)); system..ut.print(xl==x); system..ut.print(x2.equals(xl)); system..ut.print(x2==xl); system..ut.print(x2==x3); system..ut.print(x2.equals(x3)); } } 结果为:()
单项选择题 现有: class Ifs { public static void main (String [] args) { boolean state=false; int i=2; if( (++i>2) && (state=true)) i++; if( (++i>4) l l (state=false)) i++; System.out .println (i); } } 结果为:()
单项选择题 为将数组myArray的长度由3改为6,现采取以下编码: int[]myArray=new int [3]; myArray=new int[6]; 代码执行后,以下叙述哪项是正确的?()
单项选择题 程序: class TestApp{ public static void main (String[] args){ int X=5: switch (x){ case l: case 2: case 3: System. out.println(“一季度”); break; case 4: case 5: case 6: System. out.println(“二季度”); break; default: System. out.println(“三季度以上”); break; } } } 上述程序运行后的结果是哪项?()
单项选择题 已知数组array,其最后一个元素的下标是?()
多项选择题 下列有关数组的声明中,正确的是哪项?()
单项选择题 现有: class TestApp{ public static void main (String[] args){ int [5] myarray={ 10, 11, 12, 13, 14); int sum=0; for (int x : myarray) sum+=x; System. out. println( "sum= "+sum); } } 上述程序运行后的结果是哪项?()
单项选择题 程序: class TestApp{ public static void main (String[] args){ int x=6; if (x>l) System. out. println("x>l"); else if (x>5) System. out .println("x>5"); else if (x<10) System. out. println("xSystem. out .println( "x<29"); else System. out.println(“以上都不是”); } } 上述程序运行后的结果是哪项?()
单项选择题 现有: class TestApp{ public static void main (String[] args){ for (int i=0; iif(i==3) break; System. out .print (i); } } } 程序运行后的输出是哪项?()
单项选择题 现有: class Test4 { public static void main (String [] args) { boolean X=true; boolean y=false; short Z=42; if((z++==42) && (y=true))z++; if((x=false) || (++z==45)) z++; System. out.println(¨z=”+z); } } 结果为:()
单项选择题 基本数据类型float的包裹类是哪项?()
单项选择题 现有代码片段: String s="123"; String sl=S+456; 请问sl的结果是哪项?()
单项选择题 现有: class Test2 f public static void main (String [] args) { short a,b,C; a=l; b=2; C=a+b; a+=2: } 以上代码中,哪一句是错误的?()
单项选择题 现有: class Wrench2 { int size; public static void main(String [] args) { Wrench2 w=new Wrench2(); w.size=II; Wrench2 w2=go(w, w.size); System. out .print (w2. size); } static Wrench2 go(Wrench2 wr. int s) { S=12; return wr; } } 结果为()
单项选择题 现有: class Wrench f public static void main(String [] args) { Wrench w=new Wrench(); Wrench w2=new Wrench(); w2=go (w, w2); System.out.print (w2==w); } static Wrench go (Wrench wrl, Wrench wr2) { Wrench wr3=wrl; wrl=wr2; wr2=wr3; return wr3; } 结果是什么?()
单项选择题 现有: class Passer f static final int X=5; public static void main (String [] args) { new Passer().go (x); System. out .print (x); } void go (int x) { System. out .print(x++); } 结果是什么?()
单项选择题 现有: class Top { static int x=l; public Top (inty) { x*=3; } } class Middle extends Top { public Middle() {x+=1; ) public static void main (String [] args) { Middle m = new Middle(); System. out .println (x); } } 结果为:()
单项选择题 现有如下五个声明: Linel: int a_really_really_really_long_variable_name=5 ; Line2: int _hi=6; Line3: int big=Integer. getlnteger("7”); Line4:int $dollars=8; line5: int %opercent=9; 哪行无法通过编译?()