# JAVA class implementation scores

2011-04-17  来源：本站原创  分类：Java  人气：65

Title:
1, write a fraction of class to achieve score of addition, subtraction, multiplication, and division;
2, the following points from small to large order: 1 / 2, 2 / 3, 48/62, 70/20, 9 / 25

My solution is as follows, we discuss the discussion:

```package com.gzitc.exam;
/**
*  Finding the greatest common divisor, least common multiple
* @author e606#qq.com
*
*/
public class MathUtil {
/**
*  Finding the greatest common divisor two numbers, you can use the division algorithm .
*  Always with a large number divided by a smaller number, and then use the remainder to replace a larger number . Divisible by when the divisor is the greatest common divisor .
* @param a
* @param b
* @return
*/
public static long gY(long a, long b) {

long r = 1;

if(a < b) {
long t = a;
a = b;
b = t;
}

r = a % b;

while( r != 0) {
long t = r;
r = b % r;
b = t;
}

return b;
}
/**
*  Seeking Common multiple
* @param a
* @param b
* @return
*/
public static long gB(long a, long b) {
long gb = 0;
gb = a * b / gY(a, b);
return gb;
}
}
```
```package com.gzitc.exam;

/**
*  Score an entity class
* @author e606#qq.com
*
*/
public class Fraction {
/**
*  Molecular
*/
private long sun;
/**
*  The denominator
*/
private long mum;
/**
*  Instantiate one instance
* @param sun
* @param mum
*/
public Fraction(long sun, long mum) {
this.sun = sun;
this.mum = mum;
}

public long getSun() {
return sun;
}

public void setSun(long sun) {
this.sun = sun;
}

public long getMum() {
return mum;
}

public void setMum(long mum) {
this.mum = mum;
}

@Override
public String toString() {
return sun + "/" + mum;
}
/**
*  Determine whether the score is greater than 0
* @return
*/
public int isUpZero() {
if(sun * mum > 0) {
return 1;
} else {
return -1;
}
}
}
```

```package com.gzitc.exam;

public class FractionUtil {
/**
* @param fraction1
* @param fraction2
* @return
*/
public static Fraction plus(Fraction a,Fraction b) {
long r_mum = MathUtil.gB(a.getMum(), b.getMum());
long r_sun = a.getSun() * r_mum / a.getMum() + b.getSun() * r_mum / b.getMum();
return new Fraction(r_sun, r_mum);
}
/**
*  Subtraction
* @param a
* @param b
* @return
*/
public static Fraction minus(Fraction a,Fraction b) {
long r_mum = MathUtil.gB(a.getMum(), b.getMum());
long r_sun = a.getSun() * r_mum / a.getMum() - b.getSun() * r_mum / b.getMum();
return new Fraction(r_sun, r_mum);
}
/**
*  Multiplication
* @param a
* @param b
* @return
*/
public static Fraction multiplied(Fraction a,Fraction b) {
long r_sun = a.getSun() * b.getSun();
long r_mum = a.getMum() * b.getMum();
Fraction r_fraction = new Fraction(r_sun, r_mum);
return r_fraction;
}
/**
*  Division operation
* @param a
* @param b
* @return
*/
public static Fraction divided(Fraction a,Fraction b) {
long r_sun = a.getSun() * b.getMum();
long r_mum = a.getMum() * b.getSun();
Fraction r_fraction = new Fraction(r_sun, r_mum);
return r_fraction;
}

/**
*  To sort the array of scores from small to large
* @param arr
* @return
*/
public static void sort(Fraction arr[]) {
int length = arr.length;
// Bubble sort
for(int i = 0; i < length-1; i++) {
for(int j = i; j < length; j++) {
// Determine if subtraction new score is greater than 0, if greater than 0, Description arr[i] Greater than arr[j], Swap locations .
if(FractionUtil.minus(arr[i], arr[j]).isUpZero() > 0) {
Fraction temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
}
}

}
```

```package com.gzitc.exam;

public class Test {
public static void main(String args[]) {
Fraction a,b;
a = new Fraction(5,7);
b = new Fraction(3,7);
Fraction arr[] = {new Fraction(1,2), new Fraction(2,3), new Fraction(48,62),
new Fraction(70,20), new Fraction(9,25)};

System.out.println(a+"+"+b+"="+FractionUtil.plus(a, b));
System.out.println(a+"-"+b+"="+FractionUtil.minus(a, b));
System.out.println(a+"*"+b+"="+FractionUtil.multiplied(a, b));
System.out.println("("+a+")/("+b+")="+FractionUtil.divided(a, b));

System.out.print(" Array :");
for(int i = 0; i < arr.length; i++) {
System.out.print(arr[i]+"  ");
}
System.out.print(", Results from small to large :");
// Call the sort method
FractionUtil.sort(arr);

for(int i = 0; i < arr.length; i++) {
System.out.print(arr[i]+" , ");
}
}
}
```

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