程序流程控制
顺序结构：程序从上到下逐行执行，中间无任何判断和跳转
分支结构：根据条件，选择性的执行某段代码
if–else和switch–case两种分支语句
循环结构：根据循环条件，重复性的执行某段代码
while
do–while
for三种循环语句
JDK1.5提供foreach循环，方便遍历集合，数组元素

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如何从键盘获取不同类型的变量，需要使用scanner类
具体实现步骤：
1 导包：import java.util.Scanner;
2 Scanner的实例化：Scanner scan=new Scanner(System.in);
3 调用Scanner类的相关方法 next()或者nextXxx()，来获取指定类型的变量：int score=scan.nextInt();

import java.util.Scanner;
public class text6{
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		System.out.println("请输入岳小鹏期末成绩: (0-100)");
		int score = scan.nextInt();
		if (score == 100) {
			System.out.println("BMW");
		} else if (score > 80 && score <= 99) {
			System.out.println("XS");
		} else if (score >= 60 && score <= 80) {
			System.out.println("ipad");
		} else {
			System.out.println("no");
		}
	}
}

嵌套

package text1;//num1,num2,num3从小到大输出
import java.util.Scanner;
public class text6{
	public static void main(String[] args) {
		Scanner scanner=new Scanner(System.in);
		int num1=scanner.nextInt();
		System.out.println("请输入第一个数字");
		int num2=scanner.nextInt();
		System.out.println("请输入第二个数字");
		int num3=scanner.nextInt();
		System.out.println("请输入第三个数字");
		if(num1>num2) {
			if(num3<num2) {
				System.out.println(num3+","+num2+","+num1);
			}else if(num3>num1) {
				System.out.println(num2+","+num1+","+num3);
			}else {
				System.out.println(num2+","+num3+","+num1);
			}
		}else {
			if(num3<num1) {
				System.out.println(num3+","+num1+","+num2);
				
			}else if(num3>num2){
				System.out.println(num1+","+num2+","+num3);
			}else {System.out.println(num1+","+num3+","+num2);
		}
	}
}
	}