使用return string.format（…）在Java中格式化字符串

假设我想退回这样的东西： “书名书名，作者书名：$成本”

粗体的是变量。 我不知道如何使用string.format（“%s..，诸如此类”）返回此内容

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2个字符串和精度为2的浮点

String.format("Title %s, Author %s: $%f.2", bookTitle, bookAuthor, cost);

String title = "bookTitle";
String author = "bookAuthor";
double cost = 100;
String text = String.format("Title %s, Author %s: $%.2f", title, author, cost);
System.out.println(text); // prints "Title bookTitle, Author bookAuthor: $100.00"
// or System.out.pritnf("Title %s, Author %s: $%.2f", title, author, cost);

String.format("Title %s, Author %s: $%f.2", bookTitle, bookAuthor, cost);