九九乘法表

for(int j = 1;j <=9; j++){
for(int i = 1 ,i <= j; i++){
System.out.print(j+"*"+i+"="+(j*i)+"/t");
}
System.out.println();
}

遍历数组：

  public static void main(String[] args) {
        int[] numbers =  {10,20,30,40,50};
        for (int i = 0; i < numbers.length; i++) {
            System.out.println(numbers[i]);
        }
        for (int x:numbers){
            System.out.println(x);
        }
    }