Java习题集3 - 图文

}

{ }

int a[]={23,67,11,40,15}; int b[]={47,23,29,10,15}; int c[]={1,1,1,1,1};

for(int i=0;i

for(int i=0;i

System.out.print(c[i]+\System.out.println();

答：运行结果：70，90，40，50，30，

4、

import java.util.*; public class E1 {

public static void main(String args[]) {

String s=?I am Wanglin,she is my friend,she is a student?; StringTokenizer fenxi=new StringTokenizer(s,? ,?); int n=fenxi.countTokens(); while(fenxi.hasMoreTokens()) {

String s1=fenxi.nextToken(); System.out.print(s1+? ?); }

System.out.println();

System.out.println(?count=?+n); } }

答：运行结果：I am Wanglin she is my friend she is a student count=11

5、int i;

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for(i=0;i<5;i++) {

if(i==3) break;

System.out.print(i); }

System.out.println(?i=?+i);

答：运行结果：0 1 2 i=3 6、int i;

for(i=0;i<5;i++) {

if(i==3) continue;

System.out.print(i); }

System.out.println(?i=?+i);

答：运行结果：0 1 2 4 i=5

7、for(int i=0;i<2;i++) {

for(int j=0;j<3;j++) {

for(int k=0;k<10;k++)

System.out.print(’*’); System.out.println(); }

System.out.println(); }

答：运行结果：********** ********** **********

********** ********** **********

8、public class UseRef

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{

public static void main(String args[]) {

MyClass1 myobj,myref; myobj=new MyClass1(-1); myref=myobj;

System.out.println(?the original data is:?+myobj.getData()); myref.setData(10);

System.out.println(?now the data is:?+myobj.getData()); }

}

class MyClass1 {

int data;

MyClass1(int d) {

data=d;

}

int getData() {

return data; }

void setData(int d) {

data=d; } }

答：运行结果为：the original data is :-1 now the data is:10

9、 class Parent {

void printMe() {

System.out.println(?I am parent!?)； } }

class Child extends Parent

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{

void printMe() {

System.out.println(?I am child!?)； }

void printAll() {

super.printMe()； this.printMe();

printMe()；

} }

public class Test_this {

public static void main(String args[]) {

Child myC=new Child()； myC.printAll()； }

}

答：运行结果为: I am parent! I am child! I am child!

10、public static void main(String args[])

{

int array[]={1,2,3,4,5}; printArray(array); could_modify(array); printArray(array)；

}

static void could_modify(int a[]) {

for(int i=0;i

static void printArray(int a[]) {

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