Java复习编程题 30(3)

+ d + \等于 \

+ cNumber_1.complexMulti(d).toString()); } }

class ComplexNumber { //域

private double m_dRealPart; private double m_dImaginPart; //构造方法 ComplexNumber() {

m_dRealPart = 0.0; m_dImaginPart = 0.0; }

ComplexNumber(double r,double i) {

m_dRealPart = r; m_dImaginPart = i; }

ComplexNumber(ComplexNumber c) {

m_dRealPart = c.getRealPart(); m_dImaginPart = c.getImaginaryPart();

}

//get,set方法 double getRealPart() {

return m_dRealPart; }

double getImaginaryPart() {

return m_dImaginPart; }

void setRealPart(double d) {

m_dRealPart = d; }

void setImaginaryPart(double d) {

m_dImaginPart = d; }

//复数运算方法

ComplexNumber complexAdd(ComplexNumber c) {

return new ComplexNumber(

this.m_dRealPart + c.getRealPart(),

this.m_dImaginPart + c.getImaginaryPart());

}

ComplexNumber complexAdd(double c) {

return new ComplexNumber(

this.m_dRealPart + c, this.m_dImaginPart); }

ComplexNumber complexMinus(ComplexNumber c) {

return new ComplexNumber(

this.m_dRealPart - c.getRealPart(),

this.m_dImaginPart - c.getImaginaryPart()); }

ComplexNumber complexMinus(double c) {

return new ComplexNumber(

this.m_dRealPart - c, this.m_dImaginPart); }

ComplexNumber complexMulti(ComplexNumber c) {

return new ComplexNumber(

this.m_dRealPart * c.getRealPart()

- this.m_dImaginPart * c.getImaginaryPart(), this.m_dRealPart * c.getImaginaryPart() + this.m_dImaginPart * c.getRealPart());

}

ComplexNumber complexMulti(double c) {

return new ComplexNumber(

this.m_dRealPart * c, this.m_dImaginPart * c); }

//toString()

public String toString() {

return \+ m_dImaginPart + \} }

第六章：

1．有三个字符串，编写程序找出其中最大者。

2．编写一个程序，设定一个有大小写字母的字符串，先将字符串的大写字符输出，再将字符串中的小写字符输出。

3．设定5个字符串，要求只打印那些以字母“b”开头的串，编写程序完成。

4．设定一个有大小写字母的字符串和一个查找字符，使用类 String方法IndexOf()来判断在该字符串中该字符出现的次数。 1．

public class max1 {

public static void main(String args[]) {

String s1= \String s2= \String s3= \String s;

if(s1.compareTo(s2)<0) s=s2; else s=s1;

if(s.compareTo(s3)<0) s=s3;

Systrm.out.println(\} } 2．

public class out {

public static void main(String args[]) {

String s1= \

StringBuffer bufup=new StringBuffer(); StringBuffer buflow=new StringBuffer(); for(int I=0;I

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