Java 字符串类缩进()方法示例
原文:https://www . geesforgeks . org/Java-string-class-indent-method-with-examples/
JDK 12 在 Java.lang.String 类中引入了缩进()方法。此方法用于在行的开头添加或删除空格，以调整每个字符串行的缩进。
*语法:*
public String indent(int n)
*参数:*以整数 n 为输入，做相应缩进。
此外，每行都以“\n”(一个换行符)为后缀。
*程序:*
当字符串被提供给缩进()方法时，
- 它调用 lines()函数
-
**然后，对于每一行，根据下面讨论的用户案例提供的整数值进行缩进:
- 如果 n>0(正)
- 然后在每一行的开头加上 n 个空格，每行以“\n”为后缀。
- 如果 n==0
- 然后缩进保持不变，只有一行以“\n”为后缀。
- 如果 n<0(负)，则
- 如果(+n)>前导空格可用
- 然后删除每行的所有前导空格，每行以“\n”为后缀
- 如果(+n)
- 然后删除每行的(+n)个前导空格，每行以“\n”为后缀**
- 如果(+n)>前导空格可用
- 然后，用“\n”给每一行加后缀。
- 然后，连接结果字符串行并返回
- 如果 n>0(正)
*实施:*
*例 1*
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate indent() method of
// String class
// Importing basic libraries
import java.io.*;
import java.util.*;
// Class for indent() method
public class GFG {
// Main driver method
public static void main(String args[])
{
// Custom input string
String input
= "GeeksforGeeks\nA Computer Science portal for geeks.";
// Print and display the input string
System.out.println(input);
// Print the above string length
// using standard length() method
System.out.println("Input String length: "
+ input.length());
// Now, calling the indent() method
// for random value of N
// Case 1: N>0 | Positive
// Say N = 5 which is positive
// so as per procedural algorithm
// 5 white spaces are added
// at the starting of each line
String output = input.indent(5);
// Print and display output string
System.out.println(output);
// Print the new string length
// again using the length() method
System.out.println("New String length: "
+ output.length());
// Case 2: N=0 | Zero
// Call indent method with n=0
String output1 = input.indent(0);
System.out.println(output1);
System.out.println("New String length: "
+ output1.length());
// Case 3: N < 0 | Negative
// Call indent method with n=-3 (negative)
String output2 = input.indent(-3);
// Print the output string
System.out.println(output);
// Print output(new) string length
System.out.println("New String length: "
+ output2.length());
}
}
*输出:*
GeeksforGeeks
A Computer Science portal for geeks.
Input String length: 50
GeeksforGeeks
A Computer Science portal for geeks.
New String length: 61
GeeksforGeeks
A Computer Science portal for geeks.
New String length: 51
GeeksforGeeks
A Computer Science portal for geeks.
New String length: 51
*例 2:*
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program to illustrate indent() method of
// String class
// Importing basic libraries
import java.util.*;
import java.io.*;
// Class for indent() method
public class GFG {
// Main driver method
public static void main(String args[])
{
// Input string
String input = "GeeksforGeeks";
System.out.println(input);
System.out.println("Input String length: "
+ input.length());
// Call indent method on input string with n=5
// (positive)
String output = input.indent(5);
System.out.println(output);
System.out.println("New String length: "
+ output.length());
// Call indent method on output string with n=0
String output1 = output.indent(0);
System.out.println(output1);
System.out.println("New String length: "
+ output1.length());
// Call indent method on output1 string with n=-3
// (negative)
String output2 = output.indent(-3);
System.out.println(output2);
System.out.println("New String length: "
+ output2.length());
}
}
*输出:*
GeeksforGeeks
Input String length: 13
GeeksforGeeks
New String length: 19
GeeksforGeeks
New String length: 19
GeeksforGeeks
New String length: 16
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