疯狂java讲义第4章课后习题解答源码

t1.java

// created by dragon 
public class t1 {
    public static void main(String[] args){
        for(int i=1;i<=9;i++){
            for(int j=1;j<=i;j++){
                System.out.print(i+"x"+j+"="+i*j);
                if(2<=i && j!=i) System.out.print(",");
            }

            System.out.println();
        }
    }
}

t2.java

// created by dragon 
import java.lang.Integer;
public class t2{
    public static void main(String[] args){
        int n = Integer.parseInt(args[0]);
        for(int i=1;i<=n;i++){
            for(int j=n-i;j>0;j--){
                System.out.print(" ");
            }
            for(int k=1;k<=2*i-1;k++){
                System.out.