实验一
import java.util.Arrays;
public class MyArray {
private int m_Ary[]={821,2017,9,55,1000,821,2017,1};
public static int max(int[] array){
if(array==null || lengthOfArray(array)==0)
return Integer.MIN_VALUE;
int ret = array[0];
for(int t : array){
if(t>ret)
ret=t;
}
return ret;
}
public static int min(int[] array){
if(array==null || lengthOfArray(array)==0)
return Integer.MAX_VALUE;
int ret = array[0];
for(int t : array){
if(t<ret)
ret=t;
}
return ret;
}
public static int lengthOfArray(int[] array) {
return array.length;
}
public static void sort(int[] array){
Arrays.sort(array);
}
public static void printArray(int[] array){
for(int i:array){
System.out.print(i+" ");
}
System.out.println();
}
}
实验二
import java.util.Scanner;
public class MyFactorial {
public static long factorial(int i){
if(i==1||i==0)return 1;
long tmp = factorial(i-1);
System.out.println("current tmp is "+ i +" * " + tmp);
return i*tmp;
}
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
int num = scan.nextInt();
System.out.println(factorial(num));
}
}
实验三
import java.util.ArrayList;
import java.util.Comparator;
public class CombinedArray {
ArrayList<Object> array = new ArrayList<Object>();
public void addToArray(Object o){
array.add(o);
}
public void MySort(){
array.sort(new Comparator(){
@Override
public int compare(Object arg0, Object arg1) {
double a0 = Double.parseDouble(arg0.toString());
double a1 = Double.parseDouble(arg1.toString());
if( a0 > a1 )return 1;
else if(a0 < a1) return -1;
else return 0;
}
});
}
public static void main(String[] args) {
CombinedArray ca = new CombinedArray();
double a = 2.0;
float b =(float) 3.0;
int c = 4;
short d = 5;
ca.addToArray(d);
ca.addToArray(b);
ca.addToArray(c);
ca.addToArray(a);
ca.MySort();
for(Object o : ca.array){
System.out.print(o+ " " );
}
System.out.println();
}
}
实验四
abstract class MyPoint {
public abstract void show();
}
class MyPrintSquare extends MyPoint {
@Override
public void show() {
for(int i=0;i<5;++i){
for(int j=0;j<5;++j){
if(j==0 || j==4)
System.out.print('*');
else if(i==0 || i==4)
System.out.print('*');
else System.out.print(' ');
}
System.out.println();
}
}
}
class MyPrintCircle extends MyPoint{
@Override
public void show() {
String circle =
" ***** \n"+
" * * \n"+
"* *\n"+
"* *\n"+
"* *\n"+
"* *\n"+
"* *\n"+
" * * \n"+
" ***** \n";
System.out.print(circle);
}
}
public class MyPointTest {
public static void myShow(MyPoint a){
a.show();
}
public static void main(String[] args){
MyPoint mp1 = new MyPrintSquare();
MyPoint mp2 = new MyPrintCircle();
myShow(mp1);
myShow(mp2);
}
}