Tree() { prt("Planting a seedling"); height = 0; } Tree(int i) { prt("Creating new Tree that is " + i + " feet tall"); height = i; } 這一段是class Tree 的構造函數,分別代表了兩種情況, 一個是傳參數Tree t = new Tree(i);調用 Tree(int i) { prt("Creating new Tree that is " + i + " feet tall"); height = i; }另一個是不傳參數new Tree();new Tree();僅僅是生成一個實例,但是沒有句柄
prt("Planting a seedling");
height = 0;
}
Tree(int i) {
prt("Creating new Tree that is "
+ i + " feet tall");
height = i;
}
這一段是class Tree 的構造函數,分別代表了兩種情況,
一個是傳參數Tree t = new Tree(i);調用
Tree(int i) {
prt("Creating new Tree that is "
+ i + " feet tall");
height = i;
}另一個是不傳參數new Tree();new Tree();僅僅是生成一個實例,但是沒有句柄