java字符串中如何显示双引号

// args[0]:"is"
public class Test {
public static void main(String[] args) {
String str1 = "\"boy\"";                      //字符串两边含有双引号
String str2 = "He \"is\" a boy";              //字符串中间含有双引号
String str3 = "He \"" + args[0] + "\" a boy"; //字符串中间含有双引号
String str4 = "\\boy";                        //使用转义字符还可以使字符串包含其他字符

System.out.println("str1:" + str1);
System.out.println("str2:" + str2);
System.out.println("str3:" + str3);
System.out.println("str4:" + str4);
}
}
/* output:
str1:"boy"
str2:He "is" a boy
str3:He "is" a boy
str4:\boy
*/