import java.awt.Color
import java.awt.Font
import java.awt.Graphics
public class DrawString extends Applet {
public void paint(Graphics g)
{
g.setFont(new Font("宋体",Font.BOLD,36))
g.setColor(Color.green)
g.drawString("这是一个Java Applet程序",5,30)
g.setColor(Color.red)
g.drawString("欢迎学习Java",5,80)
}
}
1------------------------------------------------------------------------------import java.util.Scannerpublic class Main {public static void main(String[] args) throws IOException{Scanner scan = new Scanner(System.in) System.out.println("输入一个整数：") int num = scan.nextInt() char[] numChar = Integer.toString(num).toCharArray() for(int i = 0i<numChar.lengthi++) {System.out.println(numChar[i]) }}}2----------------------------------------------------- public class Text2 { public static void main(String[] args) { int j = 0, k = 0for (int i = 1 i <= 100i++) { if (i % 2 == 0) { j += i } else { k += i}} System.out.println("偶数和为：" + j)System.out.println("奇数和为：" + k)} }3------------------------------------------------------------------------import java.util.*public class Test { public static void main(String[] args) { Scanner san = new Scanner(System.in) int aint = 0 System.out.print("请输入一个整数: ") aint = san.nextInt() System.out.println(aint + "的二进制表示为: " + Integer.toBinaryString(aint))}}4--------------------------------------------------------------------------------public class text { public static void main(String args[]) { text t = new text()System.out.print(t.sum())}public int sum(){ int a = 0 for(int i=1i<=10i++){ int b = 1 for (int j = 1j <=ij++) { b = b*j } a=a+b } return a}}4.2----------------------------------------------------------import java.io.*public class jiecheng { public static long fac(int n) {long res=1 for(int k=2k<=nk++) res*=k return res} public static void main(String args[]) throws IOException {long sum=0int i=1,n=20 for(i=1i<=ni++) sum+=fac(i) System.out.println("前"+n+"项阶乘的为："+sum) } } 5--------------------------------------------------------------------------public class Dy3 { public static void main(String[] args) { int sum = 0 //素数和 String s=""//素数 boolean y = true for(int i = 100 i <= 1000 i++){ y=true//为每个数初始化y为真 for(int j = 2 j <i j++){ if(i % j == 0){ y = false//被除了1和本身以外的数整除为false break} } if(y) {s+=i+" "sum+=i} } System.out.println("素数为:"+s)System.out.println("素数和为:"+sum)} } 6--------------------------------------------------------------public class Demo{public static void main(String args[]){int i,jfor(i=1i<10i++){for(j=1j<=ij++) //此处如果想输入完全的9x9则将j<=i改为j<10{ System.out.print(j+"*"+i+"="+i*j+"\t")}System.out.println()}}}
