题一：
public class S1 {
public static void main(String[] args){
for(int i = 1; i <= 5; i++){
int b = i;
while(b != 0){
System.out.print("*");
b--;
}
System.out.print("\n");
}
}
}
}
题二：
public class S3 {
public static void main(String[] args){
for(int i = 1;i <= 5;i++){
int x = (2 * i) - 1;
int k = 0;
while(k != 5 - i){
System.out.print(" ");
k++;
}
while(x != 0){
System.out.print("*");
x--;
}
System.out.print("\n");
}
}
}
题三：
public class S2 {
public static void main(String[] args){
for(int i = 1; i <= 9; i++){
for(int j = 1; j <= i; j++){
System.out.print(" "+i+"*"+j+"="+i*j+" ");
}
System.out.print("\n");
}
}
}