刚开始学java,写了一个简单的循环显示乘法口诀表的小程序,不足之处还请各路大神不吝指正

[agoodhappyboy]

如题，学java几天了，只能浅薄的弄两下方法，面向对象理解不了。今天绞尽脑汁拼了这么个小程序出来，里面肯定有多问题的啦！虽然运行结果达到要求，总感觉逻辑不是很好，有不足的地方，还请各路大神不吝赐教啦！下面贴上代码：
main程序：

class Demo1 {
public static void main(String[] args) {
ChengFaKouJue cf = new ChengFaKouJue();
cf.go();
}
}
------------------------------------------------------------------------华丽分隔线---------------------------------------------------------------------------------

ChengFaKouJue 类：

import java.util.Scanner;

public final class ChengFaKouJue {
private int num; // 乘法中的最大值
private Boolean flag = true;
private int kind;
private Boolean fla = true;
private int x = 1;
private Boolean flagg = true;


public ChengFaKouJue() {
} // 无参构造方法


public ChengFaKouJue(int num) { // 有参构造方法
this.num = num;
}


public void setNum(int num) { // 设置乘法口诀表中最大的数
if (num >= 0 && num < 10) {
this.num = num;
x = 1;
} else {
System.out.println("小手一抖，输错了！请重新输入：");
fla = false;
x = 0;
}
}


public int getNum() { // 获得乘法口诀表中
return num;
}


public void setKind(int kind) {
if (kind < 3 && kind > 0) {
this.kind = kind;
x = 1;
} else {
System.out.println("您的输入有误，请重新输入：");
flagg = false;
x = 0;
}
}
public int getKind() {
return kind;
}
public int inPut() {
Scanner s = new Scanner(System.in);
int num = s.nextInt();
return num;
}

public void print_1(int num) { // 打印输出乘法口诀表
for (int i = 1; i <= num; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j + "X" + i + "=" + i * j + "\t");
}
System.out.println();
}
}


public void print_2(int num) {
for (int i = 1; i <= num; i++) {
for (int j = num; j >= i; j--) {
System.out.print(j + "X" + i + "=" + i * j + "\t");
}
System.out.println();
}
}


public void print(int num, char ch) {


}


public void go() {
while (flag) {
while (fla) {
System.out.println("想来个几乘几的？");
setNum(inPut());
if (x == 0) {
x = 1;
fla = true;
flagg = true;
continue;
} else {
while (flagg) {
System.out.println("选择一个乘法口诀表显示方式：1，2");
setKind(inPut());
if (x == 0) {
flagg = true;
x = 1;
continue;
} else {
flagg = false;
fla = false;
}
}
}
}


switch (kind) {
case 1:
print_1(num);
fla = true;
flagg = true;
break;
case 2:
print_2(num);
fla = true;
flagg = true;
break;
default:
break;
}
System.out.println("还要曳继续吗？继续：Enter确认，退出：回复“N/n”");
Scanner sc=new Scanner(System.in);
String str = sc.next();
if(str =="n"||str=="N"){
flag=false;
}else{
flag = true;
}


}
}


}