分数运算的程序

[奔跑的女孩]

请人帮忙改下下面的程序，谢谢啦
class Rational
{
private int a;
private int b;
public Rational(int a,int b)
{
this.a = a;
this.b = b;
}

public Rational(int c)
{
this.c = c;
}

public int geta()
{
return geta;
}

public void geta(int a)
{
this.a = geta;
}

public int getb()
{
return getb;
}

public void getb(int b)
{
this.b = getb;
}


public Fraction add(Fraction summand)
{
if (this.b % summand.getb() == 0)
{
summand.seta(summand.geta() * (this.b / summand.getb()));
summand.setb(this.b);
}
else if (summand.getb() % this.b == 0)
{
this.seta(summand.a * (summand.getb() / this.b));
this.setb(summand.b);
}
else
{
int tmp = this.b;
this.setb(this.b * summand.getb());
this.seta(this.a * summand.getb());
summand.setb(tmp * summand.getb());
summand.seta(tmp * summand.geta());
}
return new Fraction(this.a + summand.geta(), this.b);

public int display()
{
if (this.a % this.b == 0)
{
return "" + this.a / this.b;
}
else if (this.b % this.a == 0)
{
return 1 + "/" + this.b / this.a;
}
else
{
return this.a + "/" + this.b;
}
}

}


class shishu
{
public static void main(String[] args)
{
Fraction a = new Fraction(1, 1);
Fraction b = new Fraction(1, 2);
System.out.println(a.add(b));
}
}

[shixitong]

public class Rational {
	private int a;
	private int b;
	private int c;

	public Rational() {
	
	}
	public Rational(int a, int b) {
		this.a = a;
		this.b = b;
	}

	/**
	 * @return the a
	 */
	public int getA() {
		return a;
	}

	/**
	 * @param a
	 *            the a to set
	 */
	public void setA(int a) {
		this.a = a;
	}

	/**
	 * @return the b
	 */
	public int getB() {
		return b;
	}

	/**
	 * @param b
	 *            the b to set
	 */
	public void setB(int b) {
		this.b = b;
	}

	/**
	 * @return the c
	 */
	public int getC() {
		return c;
	}

	/**
	 * 分数相加
	 * @param summand
	 * @return
	 * @throws Exception
	 */
	public Rational add(Rational summand) throws Exception {
		if(this.b==0){
			throw new Exception("加数的分母不能为0");
		}
		if(summand.b==0){
			throw new Exception("被加数的分母不能为0");
		}
		Rational retRational = new Rational();
		if (this.b % summand.getB() == 0) {
			retRational.setA(this.a+summand.getA() * (this.b / summand.getB()));
			retRational.setB(this.b);
		} else if (summand.getB() % this.b == 0) {
			retRational.setA(summand.a+summand.a * (summand.getB() / this.b));
			retRational.setB(summand.b);
		} else {
			retRational.setB(this.b * summand.getB());
			retRational.setA(this.a * summand.getB()+this.b* summand.getA());
			
		}
		return retRational;
	}

	public String display() {
		if (this.a % this.b == 0) {
			return "" + this.a / this.b;
		} else if (this.b % this.a == 0) {
			return 1 + "/" + this.b / this.a;
		} else {
			return this.a + "/" + this.b;
		}
	}

	public static void main(String[] args) throws Exception {
		Rational a = new Rational(1, 4);
		Rational b = new Rational(1, 2);
		System.out.println("第一种情况:"+a.add(b).display());
		
		Rational a1 = new Rational(1, 2);
		Rational b1 = new Rational(1, 0);
		System.out.println("第二种情况:"+a1.add(b1).display());
		
		Rational a2 = new Rational(1, 3);
		Rational b2 = new Rational(1, 4);
		System.out.println("第三种情况:"+a2.add(b2).display());
	}
}

[shixitong]

楼主代码很混乱，语法有很多错误

[shixitong]

建议多看书多敲敲代码