Student student=new Student(); (Student2)student //在这个表达式（记得光标在表达式里面哦）按下alt+Enter，选中“哟嚯。。。好爽啊”就能自动生成下面代码 Student2 student2=new Student2(); student2.setFiled1(student.getFiled1()); student2.setFiled2(student.getFiled2()); student2.setFiled3(student.getFiled3()); student2.setFiled4(student.getFiled4()); student2.setFiled5(student.getFiled5()); student2.setFiled6(student.getFiled6()); student2.setFiled7(student.getFiled7()); student2.setFileD8(student.getFileD8()); 》》》》》》》》》》》》你还可以这样 List students=new ArrayList(); (Student2)students//在这个表达式（记得光标在表达式里面哦）按下alt+Enter，选中“哟嚯。。。好爽啊”就能自动生成下面代码 for(Student student:students){ Student2 student2= new Student2(); student2.setFiled1(student.getFiled1()); student2.setFiled2(student.getFiled2()); student2.setFiled3(student.getFiled3()); student2.setFiled4(student.getFiled4()); student2.setFiled5(student.getFiled5()); student2.setFiled6(student.getFiled6()); student2.setFiled7(student.getFiled7()); student2.setFileD8(student.getFileD8()); student2Lst.add(student2); } 不会安装idea插件请自行百度啊。