给定如下代码，程序的输出结果为? ().<br/>public class Pass{ static int j=20; public st

public class Pass{
static int j = 20;
public void amethod(int x){
x = x*2;
j = j*2;
}
public static void main(String args]){
int i = 10;
Pass p = new Pass();
p.amethod(i);
System.out.println(i+" and "+j);
}
}

选项： A:

错误:方法参数与变量不匹配

B:

20 and 40

C:

10 and 40

D:

10 and 20

}

错误:方法参数与变量不匹配

20 and 40

10 and 40

10 and 20

public class Pass{

static int j = 20;

public void amethod(int x){

x = x*2;

j = j*2;

}

public static void main(String args]){

int i = 10;

Pass p = new Pass();

p.amethod(i);

System.out.println(i+" and "+j);

}

错误:方法参数与变量不匹配

20 and 40

10 and 40

10 and 20

14. 下面代码输出结果是:public class Demo {static int j=20;public static void main(String[] args) {int i=10;Demo p=new Demo();p.mathod(i);System.out.println(i+"and"+j);}public void mathod(int x) {x=x*2;j=j*2;}} 选项： A、错误,方法参数与变量不匹配 B、 20 and 40 C、 10 and 40 D、 10 and 20

15.下面代码输出结果是: public class Demo { static int j=20; public static void main(String[] args) { int i=10; Demo p=new Demo(); p.mathod(i); System.out.println(i+"and"+j); } public void mathod(int x) { x=x*2; j=j*2; } } 选项： A、10 and 40 B、错误,方法参数与变量不匹配 C、20 and 40 D、10 and 20

16.写出程序运行结果：public class Test{ public static void leftshift(int i, int j){ i+=j; } public static void main(String args[]){ int i = 4, j = 2; leftshift(i, j); System.out.println(i); } }

public MyClass() { System.out.println("MyClass()"); }
public MyClass(int i) { System.out.println("MyClass(int)"); this.i = i; }}
public class TestMain { public static void main(String args]) { MyClass mc1 = new MyClass(); System.out.println(mc1.i); MyClass mc2 = new MyClass(10); System.out.println(mc2.i); }}

上述代码的运行结果是：（）

选项： A:

MyClass() 20 MyClass(int) 10

B:

In Static MyClass() 20 MyClass(int) 10

C:

In Static MyClass(int) 20 MyClass() 10

D:

In Static MyClass() 10 MyClass(int) 20

">17.
class MyClass { static int i = 10; static { i = 20; System.out.println("In Static"); }
public MyClass() { System.out.println("MyClass()"); }
public MyClass(int i) { System.out.println("MyClass(int)"); this.i = i; }}
public class TestMain { public static void main(String args]) { MyClass mc1 = new MyClass(); System.out.println(mc1.i); MyClass mc2 = new MyClass(10); System.out.println(mc2.i); }}

上述代码的运行结果是：（）

选项： A:

MyClass() 20 MyClass(int) 10

B:

In Static MyClass() 20 MyClass(int) 10

C:

In Static MyClass(int) 20 MyClass() 10

D:

In Static MyClass() 10 MyClass(int) 20

18.下面代码运行后输出结果是（）。public class Test{ public static void main(String[] args){ A obj = new A(); System.out.println(obj.i); }}class A{ int i = 6; public A(){ this(10); } public A(int j){ i = j; }}选项： A:6; B:10; C:0; D:程序编译错误

19.下面代码运行后输出结果是（）。public class Test{ public static void main(String[] args){ A obj = new A(); System.out.println(obj.i); }}class A{ int i = 6; public A(){ this(10); } public A(int j){ i = j; }}选项： A:10; B:程序编译错误; C:0; D:6

20.分析并给出下列程序的运行输出结果：class Shape { private static int i; protected static int j=10; Shape () { System.out.println ("i = " + i + ", j = " + j); j = 5; } private static int x1 = printInit("private Shape.x1 initialized"); static int printInit(String s) { System.out.println (s); return ++i; }}public class Circle extends Shape { int k = printInit("Circle.k initialized"); public Circle () { System.out.println ("k = " + k); System.out.println ("j = " + j); System.out.println ("x2 = " + x2); super.printInit("super"); } public static int x2 = printInit("public Circle.x2 initialized"); public static void main(String[] args) { System.out.println ("Circle constructor"); Circle b = new Circle (); System.out.println ("b.k="+b.k); }}