循坏语句

break可以在switch和循坏语句中使用

continue只能在循坏结构中使用

1.if ……else

int a=14;
	int b=5;
	if(a>b) {
		System.out.println("a>b");
	}else if(a<b) {
		System.out.println("a<b");
	}else {
		System.out.println("a=b");
	}

2.switch

char d='B';
	switch(d) {
	case 'A':
		System.out.println("80~100");
		break;
	case 'B':
		System.out.println("70~80");
		break;
	case 'C':
		System.out.println("60~70");
		break;
	default:
		System.out.println("60以下");

3.for循坏

	String s="";
	for(int a=1;a<10;a++) {
		for(int b=1;b<=a;b++) {
		s+=a+"*"+b+"="+(a*b)+"	";
		}
		s+="
";
	}
	System.out.println(s);
	

4.do……while

	int a=1;
	String s="";
	do {
		int b=a;
		do {
		s+=a+"*"+b+"="+(a*b)+"	";
		b++;
		}while(b<10);
		s+="
";
		
		a++;
		
	}while(a<10);
	System.out.println(s);

5.while

int a=1;
	String s="";
	while(a<10) {
		int b=a;
		while(b<10
				) {
			s+=a+"*"+b+"="+(a*b)+"	";
			b++;
		}
		a++;
		s+="
";
	}
System.out.println(s);
}