Java 常用类String

public class Test {
    
    
    public static void main(String[] args) {
    
    
        StringBuilder stringBuilder= new StringBuilder();
        stringBuilder.append(1);
        stringBuilder.append('a');
        stringBuilder.append("fds");
        stringBuilder.append(1.343);
        stringBuilder.append(true);
        System.out.println(stringBuilder.toString());
    }
}