我想使用for循环,遍历每个字符串并依次输出每个字符。
String a = "apple";
String b = "class";
for (int i = 0; i < a.length() ; i++) { // - 1 because 0 = 1
System.out.print(a.charAt(i));
for (int j = 0; j < b.length(); j ++) {
System.out.print(b.charAt(j));
}
}
我正在为内部循环而苦恼。
此刻,我的输出如下:
AClasspClasspClasslClasseClass
但是,我想实现以下目标:
acplpalses
扩展问题:
如何反向输出一个字符串而正常输出另一个字符串呢?
当前尝试:
for (int i = a.length() - 1; i >= 0; i--) {
System.out.println(a.charAt(i));
for (int j = 0; j < b.length(); j ++) {
System.out.println(b.charAt(j));
}
}
但是,这只是按照上面的格式输出,只是带有相反顺序的“ Apple”输出:
eclasslclasspclasspclassaclass
答案 0 :(得分:5)
您不需要两个循环,因为两个Strings
都使用相同的索引
相同顺序:
相同尺寸的简易表壳:
for (int i = 0; i < a.length(); i++) {
System.out.print(a.charAt(i));
System.out.print(b.charAt(i));
}
复杂不同尺寸的保护套:
int minLength = Math.min(a.length(), b.length());
for (int i = 0; i < minLength; i++) {
System.out.print(a.charAt(i));
System.out.print(b.charAt(i));
}
System.out.print(a.substring(minLength)); // prints the remaining if 'a' is longer
System.out.print(b.substring(minLength)); // prints the remaining if 'b' is longer
不同订单:
相同尺寸的简易表壳:
for (int i = 0; i < a.length(); i++) {
System.out.print(a.charAt(i));
System.out.print(b.charAt(b.length() - i - 1));
}
复杂不同尺寸的保护套:
int minLength = Math.min(a.length(), b.length());
for (int i = 0; i < minLength; i++) {
System.out.print(a.charAt(i));
System.out.print(b.charAt(b.length() - i - 1));
}
System.out.print(a.substring(minLength));
System.out.print(new StringBuilder(b).reverse().substring(minLength));
答案 1 :(得分:2)
使用Java 8流的另一种解决方案:
System.out.println(
IntStream.range(0, Math.min(a.length(), b.length()))
.mapToObj(i -> "" + a.charAt(i) + b.charAt(i))
.collect(Collectors.joining(""))
);
答案 2 :(得分:1)
对于扩展问题- 假设两个字符串的大小相同
for (int i = 0; i < a.length(); i++) {
System.out.print(a.charAt(a.length()-1-i));
System.out.print(b.charAt(i));
}