methload.java

Java程序设计培训教程2

public class MethLoad{
	public static void main(String args[])
	{
		MethLoad classObj = new MethLoad();
		classObj.methtest('a');
		classObj.methtest(100);
		classObj.methtest(12,23);
		classObj.methtest(4.0);	
	}
	/*加密字符，将一个字母转换成26个字母中对称位置的字母并输出*/
	void methtest(char s)
	{
		System.out.println("This method is to encrypt character.");
		char t;
		if(s<'z')
			t = (char)('z'-(s-'a'));
		else
			t = (char)('Z'-(s-'A'));
		System.out.println("The result of methtest(char) is:"+t);
		
	}
	/*求1到参数n的所有整数的和*/
	void methtest(int n)
	{
		System.out.println("This method is to calculate the sum.");
		int sum = (int)(n*(n+1)/2);
		System.out.println("The result of methtest(int) is:"+sum);
	}
	/*计算长和宽分别为d1和d2的矩形的面积*/
	void methtest(double d1,double d2)
	{
		System.out.println("This method is to calculate the area.");
		double sum = d1*d2;
		System.out.println("The result of methtest(int) is:"+sum);
	}
	/*求边长为d的正方形的周长*/
	void methtest(double d)
	{
		System.out.println("This method is to calculate the volume.");
		double sum = 4*d;
		System.out.println("The result of methtest(int) is:"+sum);
	}
}