pprint.java

这个是Java编程的经典著作Think in Java的第四版的源码

//: net/mindview/util/PPrint.java
// Pretty-printer for collections
package net.mindview.util;
import java.util.*;

public class PPrint {
  public static String pformat(Collection<?> c) {
    if(c.size() == 0) return "[]";
    StringBuilder result = new StringBuilder("[");
    for(Object elem : c) {
      if(c.size() != 1)
        result.append("\n  ");
      result.append(elem);
    }
    if(c.size() != 1)
      result.append("\n");
    result.append("]");
    return result.toString();
  }
  public static void pprint(Collection<?> c) {
    System.out.println(pformat(c));
  }
  public static void pprint(Object[] c) {
    System.out.println(pformat(Arrays.asList(c)));
  }
} ///:~