A) B) C) D) class A

public class A protected class A private class A

6£®ÏÂÁÐAÀàÖС¾´úÂë1¡¿~¡¾´úÂë5¡¿ÄÄЩÊÇ´íÎóµÄ£¿1 4

class Tom { private int x = 120; protected int y = 20; int z = 11; private void f() { x = 200;

System.out.println(x); } void g() { x = 200;

System.out.println(x); } }

public class A {

public static void main(String args[]) { Tom tom = new Tom(); tom.x = 22; //¡¾´úÂë1¡¿ tom.y = 33; //¡¾´úÂë2¡¿ tom.z = 55; //¡¾´úÂë3¡¿ tom.f(); //¡¾´úÂë4¡¿ tom.g(); //¡¾´úÂë5¡¿ } }

7£®ÏÂÁÐEÀàµÄÀàÌåÖÐÄÄЩ¡¾´úÂë¡¿ÊÇ´íÎóµÄ¡£4

class E {

int x; //¡¾´úÂë1¡¿ long y = x; //¡¾´úÂë2¡¿ public void f(int n) {

int m; //¡¾´úÂë3¡¿ int t = n+m; //¡¾´úÂë4¡¿ } }

1£®B¡£2£®D¡£3£®D¡£4£®D¡£5£®CD¡£6£®¡¾´úÂë1¡¿¡¾´úÂë4¡¿¡£7£®¡¾´úÂë4¡¿¡£ Èý¡¢ÔĶÁ³ÌÐò

1£®Ëµ³öÏÂÁÐEÀàÖС¾´úÂë1¡¿~¡¾´úÂë3¡¿µÄÊä³ö½á¹û¡£ class Fish {

int weight = 1; }

class Lake { Fish fish;

void setFish(Fish s){ fish = s; }

void foodFish(int m) {

fish.weight=fish.weight+m; } }

public class E {

public static void main(String args[]) { Fish redFish = new Fish();

System.out.println(redFish.weight); //¡¾´úÂë1¡¿ Lake lake = new Lake(); lake.setFish(redFish); lake.foodFish(120);

System.out.println(redFish.weight); //¡¾´úÂë2¡¿ System.out.println(lake.fish.weight); //¡¾´úÂë3¡¿ } }

2£®Çë˵³öAÀàÖÐSystem.out.printlnµÄÊä³ö½á¹û¡£ class B {

int x = 100,y = 200;

public void setX(int x) { x = x; }

public void setY(int y) { this.y = y; }

public int getXYSum() { return x+y; } }

public class A {

public static void main(String args[]) {

B b = new B(); b.setX(-100); b.setY(-200);

System.out.println(\ } }

3£®Çë˵³öAÀàÖÐSystem.out.printlnµÄÊä³ö½á¹û¡£ class B { int n;

static int sum=0; void setN(int n) { this.n=n; }

int getSum() {

for(int i=1;i<=n;i++) sum=sum+i; return sum; } }

public class A {

public static void main(String args[]) { B b1=new B(),b2=new B(); b1.setN(3); b2.setN(5);

int s1=b1.getSum(); int s2=b2.getSum();

System.out.println(s1+s2); } }

4£®Çë˵³öEÀàÖС¾´úÂë1¡¿,¡¾´úÂë2¡¿µÄÊä³ö½á¹ûnµÄÊä³ö½á¹û¡£ class A {

double f(int x,double y) { return x+y; }

int f(int x,int y) { return x*y; } }

public class E {

public static void main(String args[]) { A a=new A();

System.out.println(a.f(10,10)); //¡¾´úÂë1¡¿ System.out.println(a.f(10,10.0)); //¡¾´úÂë2¡¿ } }

5£®ÉÏ»úʵϰÏÂÁгÌÐò£¬Á˽â¿É±ä²ÎÊý¡£ public class E {

public static void main(String args[]) { f(1,2);

f(-1,-2,-3,-4); //¸ø²ÎÊý´«ÖµÊ±£¬Êµ²ÎµÄ¸öÊýºÜÁé»î f(9,7,6) ; }

public static void f(int ... x){ //xÊǿɱä²ÎÊýµÄ´ú±í£¬´ú±íÈô¸É¸öintÐͲÎÊý

for(int i=0;i

System.out.println(x[i]); //x[i]ÊÇx´ú±íµÄµÚi¸ö²ÎÊý(ÀàËÆÊý×é) } } }

6£®ÀàµÄ×Ö½ÚÂë½øÈëÄÚ´æʱ£¬ÀàÖеľ²Ì¬¿é»áÁ¢¿Ì±»Ö´ÐС£ÊµÏ°ÏÂÁгÌÐò£¬Á˽⾲̬¿é¡£ class AAA {

static { //¾²Ì¬¿é

System.out.println(\ÎÒÊÇAAAÖеľ²Ì¬¿é!\ } }

public class E { static { //¾²Ì¬¿é

System.out.println(\ÎÒÊÇ×îÏȱ»Ö´Ðеľ²Ì¬¿é!\ }

public static void main(String args[]) { AAA a= new AAA(); //AAAµÄ×Ö½ÚÂë½øÈëÄÚ´æ

System.out.println(\ÎÒÔÚÁ˽⾲̬(static)¿é\ } 1£®¡¾´úÂë1¡¿£º1£¬¡¾´úÂë2¡¿£º121£¬¡¾´úÂë3¡¿£º121¡£ 2£®sum=-100¡£ 3. 27¡£ 4£®¡¾´úÂë1¡¿:100£¬¡¾´úÂë2¡¿£º20.0¡£