j02060412.java

来自「经典java教材《java完美经典》一书中源码的完全收集」· Java 代码 · 共 21 行

import java.lang.*;

class j02060412
{
  public static void main(String para[])
  {
		StringBuffer sb1 = new StringBuffer( "1234567" );
		StringBuffer sb2 = new StringBuffer( sb1.toString() ); //参考新的实体，但有同样的字符串内容
		System.out.println("sb1 变动前==> sb1 = " + sb1 + "  sb2 = " + sb2); 
		sb1.delete(0,4);
		System.out.println("sb1 变动后==> sb1 = " + sb1 + "  sb2 = " + sb2);
		
		StringBuffer sb3 = new StringBuffer("1234567");
		StringBuffer sb4 = sb3; //参考同一个实体
		System.out.println("sb3 变动前==> sb3 = " + sb3 + "  sb4 = " + sb4);
		sb3.delete(0,4);
		System.out.println("sb3 变动后==> sb3 = " + sb3 + "  sb4 = " + sb4);					
  }
}