引用:

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if(条件语句)
{
程序代码
}

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引用:

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if(条件语句)
{
程序代码1
}
else
{
程序代码2
}

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引用:

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if(条件语句)
{
程序代码1
}
else if
{
程序代码2
}
else if
{
程序代码3
}
else
{
程序代码4
}

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引用:

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if(条件1)
{
                        if(条件a)
                        {
                        执行语句a
                        }
                        else
                        {
                        执行语句b
                        }
}
else
{
                        if(条件c)
                        {
                        执行语句c
                        }
                        else
                        {
                        执行语句d
                        }
}

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引用:

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        switch(表达式)
        {
            case 取值1:
            语句块
            break;
            
            case 取值2:
            语句块
            break;
            .
            .
            .
            .
            
            case 取值n:
            语句块
            break;
            
            default:
            取值n+1
            break;
            
        }

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引用:

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class Test
{
    public static void main(String [] args)
    {
        int x=2;
        switch(x)
        {
            case 1:
            System.out.println("星期一");
            break;
            
            case 2:
            System.out.println("星期二");
            break;
            
            default:
            System.out.println("不知道星期了");
            break;
            
        }

        
    }
}

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引用:

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class Test
{
    public static void main(String [] args)
    {

        for(int x=0;x<10;x++)
        {
            System.out.println(x);
        }
        
    }
}

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引用:

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        st:while(ture)
        {
            while(ture)
            {
                break st;
            }
        }

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引用:

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public class PrintOddNum
{
    public static void main(String [] args)
    {
        for (int x=0;x<10;x++)
        {
            if (x%2==0)
            continue;//continue的应用
            System.out.println(x);
        }
    }
}

---