How is the append method used in Java?

2 years ago
Noah Thompson
1 minute

In Java, the append() method is used to add a specified string, character, character array, or other appendable object to the end of a StringBuilder or StringBuffer object.

The append() method can accept a variety of parameters including strings, characters, booleans, integers, floats, etc. Depending on the type of parameter, the append() method will convert it to a string and append it to the end of a StringBuilder or StringBuffer object.

Here are some common usage examples of the append() method:

  1. Adding extra characters:
StringBuilder sb = new StringBuilder("Hello");
sb.append(" World");
System.out.println(sb.toString()); // 输出：Hello World
  1. Additional characters:
StringBuilder sb = new StringBuilder("Hello");
sb.append('!');
System.out.println(sb.toString()); // 输出：Hello!
  1. Addition of integers:
StringBuilder sb = new StringBuilder("The answer is: ");
sb.append(42);
System.out.println(sb.toString()); // 输出：The answer is: 42
  1. Additional floating-point numbers:
StringBuilder sb = new StringBuilder("The value is: ");
sb.append(3.14);
System.out.println(sb.toString()); // 输出：The value is: 3.14

The append() method can be called multiple times to continuously add content, allowing for the construction of longer strings and avoiding the frequent creation of new string objects.

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