4Java字符串注意事项

课后作业编码

• 字符的使用

public class Homework02{

	public static void main(String[] args) {
		
		char c1 = '\n';
		char c2 = '\t';
		char c3 = '\\';
		char c4 = '\r';
		char c5 = '1';
		char c6 = '2';
		char c7 = '3';
		System.out.println("开始");
		System.out.println(c1);
		System.out.println(c2);
		System.out.println(c3);
		System.out.println(c4);
		System.out.println(c5);
		System.out.println(c6);
		System.out.println(c7);

	}
}

1. 注意事项，""代表是字符串，所以字符需要''
2. 字符串相加，代表的是两个数字相加，不是跟字符串一样

public class Homework03{
	public static void main(String[] args) {
		
		String bookName1 = "唐诗300";
		String bookName2 = "小王子";

		char sex1 = '男';
		char sex2 = '女';

		double price1 = 123.12;
		double price2 = 34.2;

		System.out.println(bookName1 + bookName2);
		System.out.println(sex1 + sex2);
		System.out.println(price1 + price2);

	}
}

• 转义字符的使用

public class Homework04{

	public static void main(String[] args) {
		
		String name = "金先生";
		int age = 12;
		double grade = 99;
		char sex = '男';
		String hobby = "打羽毛球";

		System.out.println("姓名\t年龄\t成绩\t性别\t爱好\n" + 
			name + "\t" + age + "\t" + grade + "\t" + sex + "\t" + hobby);
	}
}